Что может означать такая ошибка?

выпадает в поле логин - %5C

Warning: PDOStatement::execute(): SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '5ebe553e01799a927b1d045924bbd4fd' AND status='ok'' at line 1 in /var/www/site/data/www/site.ru/application/class/Member.php on line 390