vbulletin error when viewing a thread..
 

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

Code:
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?