Vbulletinde Database Error Hatası

Arkadaşlar Son zamanlarda Mail Adresime Sürekli Vbulletin sitemin Database Hatası Geliyor (günde 10-15 kere) Hata Aşagıda Bana Yardım edebilecek Birisi var mı acaba ?

Gelen Hata

Invalid SQL:

SELECT thread.threadid, thread.title, thread.lastpost, thread.forumid, thread.replycount, thread.postusername, thread.postuserid, thread.lastposter, thread.lastposterid, thread.dateline, thread.views, thread.visible, thread.open, user.usergroupid, user.displaygroupid
FROM thread AS thread
LEFT JOIN user AS user ON (user.userid = thread.lastposterid)
WHERE NOT ISNULL(thread.threadid) AND thread.visible = '1' AND thread.open!='10' AND thread.forumid NOT IN(3,28,)
ORDER BY lastpost DESC
LIMIT 0, 15;

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 ')
ORDER BY lastpost DESC
LIMIT 0, 15' at line 4
Error Number : 1064
Request Date : Monday, June 3rd 2013 @ 12:26:08 PM
Error Date : Monday, June 3rd 2013 @ 12:26:11 PM
Script : http://www.hileleri.gen.tr/forumdisp...كمبيوتر
Referrer : http://www.hileleri.gen.tr/forumdisp...88%D8%AA%D8%B1
IP Address : 88.135.86.236
Username : Kayıtsız Kullanıcılar
Classname : vB_Database
MySQL Version :

Kullandığınız bir eklentide; WHERE NOT ISNULL(thread.threadid) AND thread.visible = '1' AND thread.open!='10' AND thread.forumid NOT IN(3,28,)

sql sorgusunda "virgül" hatası mevcut.