vbulletin error when viewing a thread..

[final kaoss]

Ok so when I goto view a thread it starts giving me this on random threads..

Database error in vBulletin 3.8.4:

Invalid SQL:

		SELECT thread.threadid, thread.forumid, thread.title, thread.prefixid, thread.taglist, postusername, postuserid,
			thread.lastpost, thread.replycount,
			forum.title AS forumtitle
			,post.pagetext AS preview
			
			
		FROM thread AS thread
		INNER JOIN forum AS forum ON (forum.forumid = thread.forumid)
		LEFT JOIN post AS post ON (post.postid = thread.firstpostid)
		
		
		
		WHERE thread.threadid IN (15168, 4538, 350, 7330, 4068, 3470, 6003, 20954, 2668, ) AND thread.visible = 1
			
			
			
		ORDER BY lastpost DESC;

MySQL 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 ') AND thread.visible = 1
			
			
			
		ORDER BY lastpost DESC' at line 13
Error Number  : 1064
Request Date  : Tuesday, January 19th 2010 @ 08:12:13 PM
Error Date    : Tuesday, January 19th 2010 @ 08:12:13 PM
Script        : http://vgchat.info/forum/showthread.php?t=21031
Referrer      : http://vgchat.info/forum/forumdisplay.php?f=6
IP Address    : -----------------------
Username      : ---------------------
Classname     : vB_Database
MySQL Version : 5.0.87-percona-highperf

What does it mean & how do I fix it?