Orsdxy

Question

Running into issues on a site running Magento 2.2.0-rc3.0/PHP 7.0.23

The following issue occurs with all 3rd party extensions either enabled or disabled.

When adding an item to comparison from category or product page or submitting a review from product page we get the following error in the browser:

1 exception(s):

Exception #0 (InvalidArgumentException): Unable to unserialize value.



Exception #0 (InvalidArgumentException): Unable to unserialize value.

#0 /home/___/public_html/app/code/Magento/Theme/Controller/Result/MessagePlugin.php(157): MagentoFrameworkSerializeSerializerJson->unserialize('[{\"type\":\"su...')

#1 /home/___/public_html/app/code/Magento/Theme/Controller/Result/MessagePlugin.php(135): MagentoThemeControllerResultMessagePlugin->getCookiesMessages()

#2 /home/___/public_html/app/code/Magento/Theme/Controller/Result/MessagePlugin.php(84): MagentoThemeControllerResultMessagePlugin->getMessages()

#3 /home/___/public_html/lib/internal/Magento/Framework/Interception/Interceptor.php(146): MagentoThemeControllerResultMessagePlugin->afterRenderResult(Object(MagentoFrameworkViewResultPageInterceptor), Object(MagentoFrameworkViewResultPageInterceptor), Object(MagentoFrameworkAppResponseHttpInterceptor))

#4 /home/___/public_html/lib/internal/Magento/Framework/Interception/Interceptor.php(153): MagentoFrameworkViewResultPageInterceptor->MagentoFrameworkInterception{closure}(Object(MagentoFrameworkAppResponseHttpInterceptor))

#5 /home/___/public_html/generated/code/Magento/Framework/View/Result/Page/Interceptor.php(26): MagentoFrameworkViewResultPageInterceptor->___callPlugins('renderResult', Array, Array)

#6 /home/___/public_html/lib/internal/Magento/Framework/App/Http.php(139): MagentoFrameworkViewResultPageInterceptor->renderResult(Object(MagentoFrameworkAppResponseHttpInterceptor))

#7 /home/___/public_html/lib/internal/Magento/Framework/App/Bootstrap.php(256): MagentoFrameworkAppHttp->launch()

#8 /home/___/public_html/index.php(39): MagentoFrameworkAppBootstrap->run(Object(MagentoFrameworkAppHttp))

#9 {main}

The error does not go away unless you clear cookies, in particular, the mage-messages cookie.
enter image description here

Any assistance in troubleshooting these errors is appreciated.

Isn't that a core bug? is there a GitHub issue for this?

– Alex
Sep 5 '18 at 20:31 — Sep 5 '18 at 20:31

Felix 30937 · Accepted Answer · 2017-11-18 00:02:00Z

The problem is in /vendor/magento/framework/Serialize/Serializer/Json.php there is a function unserialize($string) which gives you a syntax error if string is serialized (not json but php serialization).

There is a workaround - you can check if string is serialized (vs json-encoded) and then use serialize($string). Change unserialize to:

public function unserialize($string)

{

    if($this->is_serialized($string))

    {

        $string = $this->serialize($string);

    }

    $result = json_decode($string, true);

    if (json_last_error() !== JSON_ERROR_NONE) {

         throw new InvalidArgumentException('Unable to unserialize value.');



    }

    return $result;

}

and add function to check if string is serialized:

function is_serialized($value, &$result = null)

{

    // Bit of a give away this one

    if (!is_string($value))

    {

        return false;

    }

    // Serialized false, return true. unserialize() returns false on an

    // invalid string or it could return false if the string is serialized

    // false, eliminate that possibility.

    if ($value === 'b:0;')

    {

        $result = false;

        return true;

    }

    $length = strlen($value);

    $end    = '';

    switch ($value[0])

    {

        case 's':

            if ($value[$length - 2] !== '"')

            {

                return false;

            }

        case 'b':

        case 'i':

        case 'd':

            // This looks odd but it is quicker than isset()ing

            $end .= ';';

        case 'a':

        case 'O':

            $end .= '}';

            if ($value[1] !== ':')

            {

                return false;

            }

            switch ($value[2])

            {

                case 0:

                case 1:

                case 2:

                case 3:

                case 4:

                case 5:

                case 6:

                case 7:

                case 8:

                case 9:

                    break;

                default:

                    return false;

            }

        case 'N':

            $end .= ';';

            if ($value[$length - 1] !== $end[0])

            {

                return false;

            }

            break;

        default:

            return false;

    }

    if (($result = @unserialize($value)) === false)

    {

        $result = null;

        return false;

    }

    return true;

}

After save fe. category without problem, You can restore class to default and there wont be such problem in future.

Check what happens if the value a:0:{} is passed. Go line by line. What happens if the result of unserialize is passed to a strong typed method that is expecting an array? You might want to change your answer. — May 1 '18 at 10:47

CraigCraig 7371519 · Accepted Answer · 2017-10-11 14:02:14Z

20

I was able to resolve this issue by Flushing my Redis Cache from the CLI

redis-cli flushall

I hope this helps future users.

answered Oct 11 '17 at 14:02

Craig

7371519

1

Nicely done. This should probably be the accepted answer.

– Shawn Abramson
May 16 '18 at 15:39

It seems to not always be the solution. In my case I do not even use redis (yet)

– Alex
Sep 5 '18 at 20:40

thanks. i restarted varnish, thinking that would flush it, but this did the trick.

– ladle3000
Jan 13 at 23:49

add a comment |

Sameer BhayaniSameer Bhayani 708417 · Accepted Answer · 2018-03-21 05:54:11Z

Do not edit core files for solution. Override following way
Just put following line in di.xml inside etc directory

<preference for="MagentoFrameworkSerializeSerializerJson" type="NamespaceModuleNameSerializeSerializerJson" />

And inside NamespaceModuleNameSerializeSerializer Directory: file Json.php

<?php

namespace NamespaceModuleNameSerializeSerializer;







class Json extends MagentoFrameworkSerializeSerializerJson

{





    /**

     * {@inheritDoc}

     * @since 100.2.0

     */

    public function unserialize($string)

    {

      if($this->is_serialized($string))

        {

            $string = $this->serialize($string);

        }

        $result = json_decode($string, true);

        if (json_last_error() !== JSON_ERROR_NONE) {

             throw new InvalidArgumentException('Unable to unserialize value.');



        }

        return $result;

    }





    function is_serialized($value, &$result = null)

    {

    // Bit of a give away this one

        if (!is_string($value))

        {

            return false;

        }

        // Serialized false, return true. unserialize() returns false on an

        // invalid string or it could return false if the string is serialized

        // false, eliminate that possibility.

        if ($value === 'b:0;')

        {

            $result = false;

            return true;

        }

        $length = strlen($value);

        $end    = '';

        switch ($value[0])

        {

            case 's':

                if ($value[$length - 2] !== '"')

                {

                    return false;

                }

            case 'b':

            case 'i':

            case 'd':

                // This looks odd but it is quicker than isset()ing

                $end .= ';';

            case 'a':

            case 'O':

                $end .= '}';

                if ($value[1] !== ':')

                {

                    return false;

                }

                switch ($value[2])

                {

                    case 0:

                    case 1:

                    case 2:

                    case 3:

                    case 4:

                    case 5:

                    case 6:

                    case 7:

                    case 8:

                    case 9:

                        break;

                    default:

                        return false;

                }

            case 'N':

                $end .= ';';

                if ($value[$length - 1] !== $end[0])

                {

                    return false;

                }

                break;

            default:

                return false;

        }

        if (($result = @unserialize($value)) === false)

        {

            $result = null;

            return false;

        }

        return true;

    }

}

Works perfectly

The implementation is flawed. What happens if the value a:0:{} is passed to Json:unserialize method? Is it the desired behaviour? What is the point of the result variable in is_serialized method? It's not returned and it doesn't have impact over anything as at method call no variable is passed as second argument. — May 1 '18 at 10:51
This should be the accepted solution, and is much better than the post above to edit the file directly in vendor. More than likely, you'll have to run the setup upgrade task locally and then again on staging/production, so it'll have to persist environments and vendor/ directory is an artifact created at build time. — Aug 28 '18 at 13:54
@vitoriodachef I'm facing the exact case you have mentioned. Do you have found any solution? — Dec 5 '18 at 4:50
I have used following function to decide private function isSerialized($value) { return (boolean) preg_match('/^((s|i|d|b|a|O|C):|N;)/', $value); } — Dec 20 '18 at 10:50

ChuckChuck 2811212 · Accepted Answer · 2017-09-26 17:58:31Z

3

It turned out to be a permissions issue, where magento was setting permissions for generated files that were restricted on this server.

Solved by creating magento_umask file in the root directory with the appropriate umask for the server.

See http://devdocs.magento.com/guides/v2.2/install-gde/install/post-install-umask.html for additional details.

answered Sep 26 '17 at 17:58

Chuck

2811212

Hello, I am facing the related issue like this. Can you please look in to this .

– Aditya Shah
May 14 '18 at 7:07

add a comment |

Tahir Iqbal NajamTahir Iqbal Najam 113 · Accepted Answer · 2018-01-20 06:36:04Z

1

It's mostly related with Redis cache, so try to flush out this with simple command in your SSH

redis-cli flushall

answered Jan 20 '18 at 6:36

Tahir Iqbal Najam

113

add a comment |

Adam JacksonAdam Jackson 111 · Accepted Answer · 2018-04-13 09:56:38Z

Sameers' answer above worked for me although i had to use different code in the block.

public function serialize($data)

{

    $result = json_encode($data);

    if (false === $result) {

        throw new InvalidArgumentException('Unable to serialize value.');

    }

    return $result;

}



function is_serialized($value, &$result = null)

{

    // Bit of a give away this one

    if (!is_string($value))

    {

        return false;

    }

    // Serialized false, return true. unserialize() returns false on an

    // invalid string or it could return false if the string is serialized

    // false, eliminate that possibility.

    if ($value === 'b:0;')

    {

        $result = false;

        return true;

    }

    $length = strlen($value);

    $end    = '';

    switch ($value[0])

    {

        case 's':

            if ($value[$length - 2] !== '"')

            {

                return false;

            }

        case 'b':

        case 'i':

        case 'd':

            // This looks odd but it is quicker than isset()ing

            $end .= ';';

        case 'a':

        case 'O':

            $end .= '}';

            if ($value[1] !== ':')

            {

                return false;

            }

            switch ($value[2])

            {

                case 0:

                case 1:

                case 2:

                case 3:

                case 4:

                case 5:

                case 6:

                case 7:

                case 8:

                case 9:

                    break;

                default:

                    return false;

            }

        case 'N':

            $end .= ';';

            if ($value[$length - 1] !== $end[0])

            {

                return false;

            }

            break;

        default:

            return false;

    }

    if (($result = @unserialize($value)) === false)

    {

        $result = null;

        return false;

    }

    return true;

}



/**

 * {@inheritDoc}

 */

public function unserialize($string)

{

    if($this->is_serialized($string))

        {

        $result = $this->serialize($string);

        }

    $result = json_decode($string, true);



    return $result;

}

Praveen P. RokadePraveen P. Rokade 111 · Accepted Answer · 2018-05-11 19:23:31Z

1

After flushing Redis the issue has sorted.
Thank you Craig for the solution.

I'm using port 6379 for cache, so I run command :

redis-cli -p 6379 flushall

answered May 11 '18 at 19:23

Praveen P. Rokade

111

add a comment |

Rama Chandran M 2,71181430 · Accepted Answer · 2018-09-03 09:50:59Z

ROOT directory
1. public_html/vendor/magento/framework/Serialize/Serializer/Json.php

Download JSON.php https://gist.github.com/manojind/9f18bbecaeb3e2bbfb056a634ade62a2

2. Just replace below function (unserialize) and add new function OR just download the attached file and replace with default

public function unserialize($string)

{

    if($this->is_serialized($string))

    {

        $string = $this->serialize($string);

    }

    $result = json_decode($string, true);

    if (json_last_error() !== JSON_ERROR_NONE) {

         throw new InvalidArgumentException('Unable to unserialize value.');



    }

    return $result;

}

3. Add new function :

function is_serialized($value, &$result = null)

{



    if (!is_string($value))

    {

        return false;

    }



    if ($value === 'b:0;')

    {

        $result = false;

        return true;

    }

    $length = strlen($value);

    $end    = '';

    switch ($value[0])

    {

        case 's':

            if ($value[$length - 2] !== '"')

            {

                return false;

            }

        case 'b':

        case 'i':

        case 'd':

                       $end .= ';';

        case 'a':

        case 'O':

            $end .= '}';

            if ($value[1] !== ':')

            {

                return false;

            }

            switch ($value[2])

            {

                case 0:

                case 1:

                case 2:

                case 3:

                case 4:

                case 5:

                case 6:

                case 7:

                case 8:

                case 9:

                    break;

                default:

                    return false;

            }

        case 'N':

            $end .= ';';

            if ($value[$length - 1] !== $end[0])

            {

                return false;

            }

            break;

        default:

            return false;

    }

    if (($result = @unserialize($value)) === false)

    {

        $result = null;

        return false;

    }

    return true;

}

BinodBinod 247311 · Accepted Answer · 2018-03-07 11:18:00Z

I was getting the error in a CMS page in front end.

It was the Magento widget code in the CMS Page Content that was causing problem(which I copied from another source). I deleted the widget code and inserted the same widget using the Insert Widget button in the CMS Page edit screen and it worked.

The above process formatted the widget code differently and it made the error go away.

KirbyKirby 421411 · Accepted Answer · 2018-10-16 12:20:28Z

I found out that whole serialized data cannot be fit into a database MySQL table column with TEXT data type.
I just found the column flag_data value of system_config_snapshot line is trimmed.

I had to change it to MEDIUMTEXT for this column flag.flag_data.

Chris RogersChris Rogers 228210 · Accepted Answer · 2019-01-17 01:03:04Z

I personally found this issue reared it's head running the command:

php bin/magento setup:upgrade

After a migration. I found out that I was missing the "crypt" hash key in src/app/etc/env.php:

<?php

return [

    'backend' => [

        'frontName' => 'admin'

    ],

    'crypt' => [

        'key' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

    ],



    ...

Ensure this is not empty and preferably matches your projects' other environments!

Felix 30937 · Accepted Answer · 2017-11-18 00:02:00Z

The problem is in /vendor/magento/framework/Serialize/Serializer/Json.php there is a function unserialize($string) which gives you a syntax error if string is serialized (not json but php serialization).

There is a workaround - you can check if string is serialized (vs json-encoded) and then use serialize($string). Change unserialize to:

public function unserialize($string)

{

    if($this->is_serialized($string))

    {

        $string = $this->serialize($string);

    }

    $result = json_decode($string, true);

    if (json_last_error() !== JSON_ERROR_NONE) {

         throw new InvalidArgumentException('Unable to unserialize value.');



    }

    return $result;

}

and add function to check if string is serialized:

function is_serialized($value, &$result = null)

{

    // Bit of a give away this one

    if (!is_string($value))

    {

        return false;

    }

    // Serialized false, return true. unserialize() returns false on an

    // invalid string or it could return false if the string is serialized

    // false, eliminate that possibility.

    if ($value === 'b:0;')

    {

        $result = false;

        return true;

    }

    $length = strlen($value);

    $end    = '';

    switch ($value[0])

    {

        case 's':

            if ($value[$length - 2] !== '"')

            {

                return false;

            }

        case 'b':

        case 'i':

        case 'd':

            // This looks odd but it is quicker than isset()ing

            $end .= ';';

        case 'a':

        case 'O':

            $end .= '}';

            if ($value[1] !== ':')

            {

                return false;

            }

            switch ($value[2])

            {

                case 0:

                case 1:

                case 2:

                case 3:

                case 4:

                case 5:

                case 6:

                case 7:

                case 8:

                case 9:

                    break;

                default:

                    return false;

            }

        case 'N':

            $end .= ';';

            if ($value[$length - 1] !== $end[0])

            {

                return false;

            }

            break;

        default:

            return false;

    }

    if (($result = @unserialize($value)) === false)

    {

        $result = null;

        return false;

    }

    return true;

}

After save fe. category without problem, You can restore class to default and there wont be such problem in future.

Check what happens if the value a:0:{} is passed. Go line by line. What happens if the result of unserialize is passed to a strong typed method that is expecting an array? You might want to change your answer. — May 1 '18 at 10:47

CraigCraig 7371519 · Accepted Answer · 2017-10-11 14:02:14Z

20

I was able to resolve this issue by Flushing my Redis Cache from the CLI

redis-cli flushall

I hope this helps future users.

answered Oct 11 '17 at 14:02

Craig

7371519

1

Nicely done. This should probably be the accepted answer.

– Shawn Abramson
May 16 '18 at 15:39

It seems to not always be the solution. In my case I do not even use redis (yet)

– Alex
Sep 5 '18 at 20:40

thanks. i restarted varnish, thinking that would flush it, but this did the trick.

– ladle3000
Jan 13 at 23:49

add a comment |

Sameer BhayaniSameer Bhayani 708417 · Accepted Answer · 2018-03-21 05:54:11Z

Do not edit core files for solution. Override following way
Just put following line in di.xml inside etc directory

<preference for="MagentoFrameworkSerializeSerializerJson" type="NamespaceModuleNameSerializeSerializerJson" />

And inside NamespaceModuleNameSerializeSerializer Directory: file Json.php

<?php

namespace NamespaceModuleNameSerializeSerializer;







class Json extends MagentoFrameworkSerializeSerializerJson

{





    /**

     * {@inheritDoc}

     * @since 100.2.0

     */

    public function unserialize($string)

    {

      if($this->is_serialized($string))

        {

            $string = $this->serialize($string);

        }

        $result = json_decode($string, true);

        if (json_last_error() !== JSON_ERROR_NONE) {

             throw new InvalidArgumentException('Unable to unserialize value.');



        }

        return $result;

    }





    function is_serialized($value, &$result = null)

    {

    // Bit of a give away this one

        if (!is_string($value))

        {

            return false;

        }

        // Serialized false, return true. unserialize() returns false on an

        // invalid string or it could return false if the string is serialized

        // false, eliminate that possibility.

        if ($value === 'b:0;')

        {

            $result = false;

            return true;

        }

        $length = strlen($value);

        $end    = '';

        switch ($value[0])

        {

            case 's':

                if ($value[$length - 2] !== '"')

                {

                    return false;

                }

            case 'b':

            case 'i':

            case 'd':

                // This looks odd but it is quicker than isset()ing

                $end .= ';';

            case 'a':

            case 'O':

                $end .= '}';

                if ($value[1] !== ':')

                {

                    return false;

                }

                switch ($value[2])

                {

                    case 0:

                    case 1:

                    case 2:

                    case 3:

                    case 4:

                    case 5:

                    case 6:

                    case 7:

                    case 8:

                    case 9:

                        break;

                    default:

                        return false;

                }

            case 'N':

                $end .= ';';

                if ($value[$length - 1] !== $end[0])

                {

                    return false;

                }

                break;

            default:

                return false;

        }

        if (($result = @unserialize($value)) === false)

        {

            $result = null;

            return false;

        }

        return true;

    }

}

Works perfectly

The implementation is flawed. What happens if the value a:0:{} is passed to Json:unserialize method? Is it the desired behaviour? What is the point of the result variable in is_serialized method? It's not returned and it doesn't have impact over anything as at method call no variable is passed as second argument. — May 1 '18 at 10:51
This should be the accepted solution, and is much better than the post above to edit the file directly in vendor. More than likely, you'll have to run the setup upgrade task locally and then again on staging/production, so it'll have to persist environments and vendor/ directory is an artifact created at build time. — Aug 28 '18 at 13:54
@vitoriodachef I'm facing the exact case you have mentioned. Do you have found any solution? — Dec 5 '18 at 4:50
I have used following function to decide private function isSerialized($value) { return (boolean) preg_match('/^((s|i|d|b|a|O|C):|N;)/', $value); } — Dec 20 '18 at 10:50

ChuckChuck 2811212 · Accepted Answer · 2017-09-26 17:58:31Z

3

It turned out to be a permissions issue, where magento was setting permissions for generated files that were restricted on this server.

Solved by creating magento_umask file in the root directory with the appropriate umask for the server.

See http://devdocs.magento.com/guides/v2.2/install-gde/install/post-install-umask.html for additional details.

answered Sep 26 '17 at 17:58

Chuck

2811212

Hello, I am facing the related issue like this. Can you please look in to this .

– Aditya Shah
May 14 '18 at 7:07

add a comment |

Tahir Iqbal NajamTahir Iqbal Najam 113 · Accepted Answer · 2018-01-20 06:36:04Z

1

It's mostly related with Redis cache, so try to flush out this with simple command in your SSH

redis-cli flushall

answered Jan 20 '18 at 6:36

Tahir Iqbal Najam

113

add a comment |

Adam JacksonAdam Jackson 111 · Accepted Answer · 2018-04-13 09:56:38Z

Sameers' answer above worked for me although i had to use different code in the block.

public function serialize($data)

{

    $result = json_encode($data);

    if (false === $result) {

        throw new InvalidArgumentException('Unable to serialize value.');

    }

    return $result;

}



function is_serialized($value, &$result = null)

{

    // Bit of a give away this one

    if (!is_string($value))

    {

        return false;

    }

    // Serialized false, return true. unserialize() returns false on an

    // invalid string or it could return false if the string is serialized

    // false, eliminate that possibility.

    if ($value === 'b:0;')

    {

        $result = false;

        return true;

    }

    $length = strlen($value);

    $end    = '';

    switch ($value[0])

    {

        case 's':

            if ($value[$length - 2] !== '"')

            {

                return false;

            }

        case 'b':

        case 'i':

        case 'd':

            // This looks odd but it is quicker than isset()ing

            $end .= ';';

        case 'a':

        case 'O':

            $end .= '}';

            if ($value[1] !== ':')

            {

                return false;

            }

            switch ($value[2])

            {

                case 0:

                case 1:

                case 2:

                case 3:

                case 4:

                case 5:

                case 6:

                case 7:

                case 8:

                case 9:

                    break;

                default:

                    return false;

            }

        case 'N':

            $end .= ';';

            if ($value[$length - 1] !== $end[0])

            {

                return false;

            }

            break;

        default:

            return false;

    }

    if (($result = @unserialize($value)) === false)

    {

        $result = null;

        return false;

    }

    return true;

}



/**

 * {@inheritDoc}

 */

public function unserialize($string)

{

    if($this->is_serialized($string))

        {

        $result = $this->serialize($string);

        }

    $result = json_decode($string, true);



    return $result;

}

Praveen P. RokadePraveen P. Rokade 111 · Accepted Answer · 2018-05-11 19:23:31Z

1

After flushing Redis the issue has sorted.
Thank you Craig for the solution.

I'm using port 6379 for cache, so I run command :

redis-cli -p 6379 flushall

answered May 11 '18 at 19:23

Praveen P. Rokade

111

add a comment |

Rama Chandran M 2,71181430 · Accepted Answer · 2018-09-03 09:50:59Z

ROOT directory
1. public_html/vendor/magento/framework/Serialize/Serializer/Json.php

Download JSON.php https://gist.github.com/manojind/9f18bbecaeb3e2bbfb056a634ade62a2

2. Just replace below function (unserialize) and add new function OR just download the attached file and replace with default

public function unserialize($string)

{

    if($this->is_serialized($string))

    {

        $string = $this->serialize($string);

    }

    $result = json_decode($string, true);

    if (json_last_error() !== JSON_ERROR_NONE) {

         throw new InvalidArgumentException('Unable to unserialize value.');



    }

    return $result;

}

3. Add new function :

function is_serialized($value, &$result = null)

{



    if (!is_string($value))

    {

        return false;

    }



    if ($value === 'b:0;')

    {

        $result = false;

        return true;

    }

    $length = strlen($value);

    $end    = '';

    switch ($value[0])

    {

        case 's':

            if ($value[$length - 2] !== '"')

            {

                return false;

            }

        case 'b':

        case 'i':

        case 'd':

                       $end .= ';';

        case 'a':

        case 'O':

            $end .= '}';

            if ($value[1] !== ':')

            {

                return false;

            }

            switch ($value[2])

            {

                case 0:

                case 1:

                case 2:

                case 3:

                case 4:

                case 5:

                case 6:

                case 7:

                case 8:

                case 9:

                    break;

                default:

                    return false;

            }

        case 'N':

            $end .= ';';

            if ($value[$length - 1] !== $end[0])

            {

                return false;

            }

            break;

        default:

            return false;

    }

    if (($result = @unserialize($value)) === false)

    {

        $result = null;

        return false;

    }

    return true;

}

BinodBinod 247311 · Accepted Answer · 2018-03-07 11:18:00Z

I was getting the error in a CMS page in front end.

It was the Magento widget code in the CMS Page Content that was causing problem(which I copied from another source). I deleted the widget code and inserted the same widget using the Insert Widget button in the CMS Page edit screen and it worked.

The above process formatted the widget code differently and it made the error go away.

KirbyKirby 421411 · Accepted Answer · 2018-10-16 12:20:28Z

I found out that whole serialized data cannot be fit into a database MySQL table column with TEXT data type.
I just found the column flag_data value of system_config_snapshot line is trimmed.

I had to change it to MEDIUMTEXT for this column flag.flag_data.

Chris RogersChris Rogers 228210 · Accepted Answer · 2019-01-17 01:03:04Z

I personally found this issue reared it's head running the command:

php bin/magento setup:upgrade

After a migration. I found out that I was missing the "crypt" hash key in src/app/etc/env.php:

<?php

return [

    'backend' => [

        'frontName' => 'admin'

    ],

    'crypt' => [

        'key' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'

    ],



    ...

Ensure this is not empty and preferably matches your projects' other environments!

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