Have you faced any error while working with system configuration in Magento 2.2 admin panel? The error says “Unable to unserialize value”. The error is caused because of \Magento\Framework\serialize\Serializer\Json class.
The problem is caused because of the file vendor\magento\framework\serialize\Serializer\Json.php.
To get the detailed information, you can refer to the article at: https://meetanshi.com/blog/solved-unable-to-unserialize-value-in-magento-2-2/
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