A Database Error Occurred

Error Number: 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 '-20, 20' at line 6

SELECT * FROM (`discuss`) WHERE `status` = 1 AND `folder_id` = '156' ORDER BY `modify_time` desc LIMIT -20, 20

Filename: /var/www/html/ohsc/hsc/models/discuss_model.php

Line Number: 35