Discuz! info: MySQL Query Error

Time: 2010-3-10 3:34pm
Script: /productlist.php

SQL: select * from car_product_class where pc_id =
Error: 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 '' at line 1
Errno.: 1064

Similar error report has beed dispatched to administrator before.