Magento 2 Unable to unserialize value on the product page.

Please change the unserialize function in vendor/magento/framework/Serialize/Serializer/Json.php.

You also need to check whether the string is serialized or not.

public function unserialize($string)
{
    /************** Custom code ***********/
    if($this->is_serialized($string))
    {
        $string = $this->serialize($string);
    }
    /************** Custom code ***********/
    $result = json_decode($string, true);
    if (json_last_error() !== JSON_ERROR_NONE) {
         throw new \InvalidArgumentException('Unable to unserialize value.');

    }
    return $result;
}

public function unserialize($string)

{

/************** Custom code ***********/

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

{

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

}

/************** Custom code ***********/

$result = json_decode($string, true);

if (json_last_error() !== JSON_ERROR_NONE) {

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

}

return $result;

}

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