We are having the same error. The error message shows up in Messages, but not in system error log. Yes, error logging is enabled.
aMySQLi class error: Try to escape non-string value: array ( 0 => '748', ) in /home/rentmaso/public_html/shop/core/database/amysqli.php on line 118
Thank you for any tips. You guys are great!
Some new customers are reporting that they can't login. I don't know if this error is related.