Update Error

Hi,

This must come from the same process behind the "check database" button of the HikaShop configuration page.
If you click that button, you should get the same error.

In that case, it means that the update was successful as this process is done by HikaShop's update system right at the end.

Also, this probably means that there is a difference between the collation of Joomla's users table and what HikaShop expects it to be.
Ideally, you want to go in your PHPMyAdmin and change the collation of the "email" column of the users table to be utf8mb3_unicode_ci instead of utf8mb3_general_ci
That way, you won't get the error next time you update HikaShop or you use the check database process.