The problem for "There has been an error processing your request" on Magento2

[alex_chang1]

Dear Sirs,

When we update the product details , we find our website shows the following errors. Could you help me to solve the problem ??

{"0":"Unable to serialize value. Error: Malformed UTF-8 characters, possibly incorrectly encoded","1":"<pre>#1 Magento\\Framework\\App\\PageCache\\Kernel->process(&Magento\\Framework\\App\\Response\\Http\\Interceptor#00000000258684da000000005c486028#) called at [vendor\/magento\/module-page-cache\/Model\/Controller\/Result\/BuiltinPlugin.php:96]\n#2 Magento\\PageCache\\Model\\Controller\\Result\\BuiltinPlugin->afterRenderResult(&Magento\\Framework\\View\\Result\\Page\\Interceptor#0000000025868014000000005c486028#, &Magento\\Framework\\View\\Result\\Page\\Interceptor#0000000025868014000000005c486028#, &Magento\\Framework\\App\\Response\\Http\\Interceptor#00000000258684da000000005c486028#) called at [vendor\/magento\/framework\/Interception\/Interceptor.php:146]\n#3 Magento\\Framework\\View\\Result\\Page\\Interceptor->Magento\\Framework\\Interception\\{closure}(&Magento\\Framework\\App\\Response\\Http\\Interceptor#00000000258684da000000005c486028#) called at [vendor\/magento\/framework\/Interception\/Interceptor.php:153]\n#4 Magento\\Framework\\View\\Result\\Page\\Interceptor->___callPlugins('renderResult', array(&Magento\\Framework\\App\\Response\\Http\\Interceptor#00000000258684da000000005c486028#), NULL) called at [generated\/code\/Magento\/Framework\/View\/Result\/Page\/Interceptor.php:130]\n#5 Magento\\Framework\\View\\Result\\Page\\Interceptor->renderResult(&Magento\\Framework\\App\\Response\\Http\\Interceptor#00000000258684da000000005c486028#) called at [vendor\/magento\/framework\/App\/Http.php:141]\n#6 Magento\\Framework\\App\\Http->launch() called at [generated\/code\/Magento\/Framework\/App\/Http\/Interceptor.php:24]\n#7 Magento\\Framework\\App\\Http\\Interceptor->launch() called at [vendor\/magento\/framework\/App\/Bootstrap.php:261]\n#8 Magento\\Framework\\App\\Bootstrap->run(&Magento\\Framework\\App\\Http\\Interceptor#00000000258684d3000000005c486028#) called at [index.php:39]\n<\/pre>","url":"\/","script_name":"\/index.php"}

[Manish Mittal]

@alex_chang1 

Correct your file
..vendor/magento/framework/Serialize/Serializer/Json.php

use Magento\Framework\Serialize\SerializerInterface;

/**
 * Serialize data to JSON, unserialize JSON encoded data
 *
 * @api
 * @since 101.0.0
 */
class Json implements SerializerInterface
{
    /**
     * @inheritDoc
     * @since 101.0.0
     */
    public function serialize($data)
    {
        
        
        $result = json_encode(utf8ize($data));
        if (false === $result) {
            throw new \InvalidArgumentException("Unable to serialize value2. Error: " . json_last_error_msg() );
        }
        return $result;
    }

    /**
     * @inheritDoc
     * @since 101.0.0
     */
    public function unserialize($string)
    {
        
        
        $result = json_decode($string, true);
        if (json_last_error() !== JSON_ERROR_NONE) {
            throw new \InvalidArgumentException("Unable to unserialize value. Error: " . json_last_error_msg());
        }
        return $result;
    }
    
}


function utf8ize( $mixed ) {
    if (is_array($mixed)) {
        foreach ($mixed as $key => $value) {
            $mixed[$key] = utf8ize($value);
        }
    } elseif (is_string($mixed)) {
        return mb_convert_encoding($mixed, "UTF-8", "UTF-8");
    }
    return $mixed;
}
        

[Bhanu Periwal]

Hi @alex_chang1 

Kindly refer below link:

https://magento.stackexchange.com/questions/202448/magento-2-2-1-unable-to-serialize-value

https://community.magento.com/t5/Magento-2-x-Version-Upgrades/Unable-to-serialize-value-Magento-2-2-...

It will help you to resolve issues.

If issues resolve, Please click on 'Kudos' & Accept as Solution!

[alex_chang1]

The problem is not solved. 

We remember we are using "configurable products" , after that , we get this error.