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Getting error:

Unable to unserialize value

enter image description here

vendor/magento/framework/serialize/json.php
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Please check if your database has any serialized values, magento2.2.x does not support serialise/unserialize data, convert to json array.

Check customer_eav_attribute table for null values. select * from `customer_eav_attribute` where (`validate_rules` ='');

Query ran to resolve the issue:

UPDATE `customer_eav_attribute` SET validate_rules='[]' where (`validate_rules` ='');

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