Error page: /products.php?page=2

Error infos: 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 '-9,9' at line 1
Error sql: SELECT qf_act.* FROM qf_act left join qf_type on `qf_act`.PID=`qf_type`.ID where `qf_act`.PID IN(2) ORDER BY qf_type.`ORDER` ,qf_act.`ORDER` DESC ,qf_act.`ID` limit -9,9