1 exception(s): Exception #0 (InvalidArgumentException): Unable to unserialize value

Question

1 exception(s): Exception #0 (InvalidArgumentException): Unable to unserialize value when i add new customer and open existing customer In Admin side, Error is mention in above screenshot.

Answer 1

Open the this file :- /vendor/magento/framework/Serialize/Serializer/Json.php

Find:

public function unserialize($string)
{
    $result = json_decode($string, true);
    if (json_last_error() !== JSON_ERROR_NONE) {
        throw new \InvalidArgumentException('Unable to unserialize value.');
    }
    return $result;
}

replace by:

public function unserialize($string)
{
    $result = json_decode($string, true);
    if (json_last_error() !== JSON_ERROR_NONE) {
        if(false !== @unserialize($string)){
            return unserialize($string);
        }
        throw new \InvalidArgumentException('Unable to unserialize value.');
    }
    return $result;
}

And run the php bin/magento c:f

And refer this links :-

Magento 2.2: Unable to unserialize value?