Discuz! Database 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 '4316) group by aid limit 5' at line 1

select att.*,tit.title as title from portal_attachment as att left join portal_article_title as tit on att.aid=tit.aid where att.aid in (4755,4696,3084,,4316) group by aid limit 5

PHP Debug

No.	File	Line	Code
1	plugin.php	47	include(%s)
2	source/plugin/poemcontest/poemcontest.inc.php	121	result_arr(%s)
3	source/plugin/poemcontest/class/function.php	3	discuz_database::query(%s)
4	source/class/discuz/discuz_database.php	136	db_driver_mysql->query(%s, false, false)
5	source/class/db/db_driver_mysql.php	151	db_driver_mysql->halt(%s, %d, %s)
6	source/class/db/db_driver_mysql.php	218	break()