Suite Upgrade but Online.php fault?

[محروم.كوم]

Any ideas why this is keep dropping into the DB error log

PHP Code:
Database error in vBulletin 4.0.8:
Invalid SQL:
SELECT thread.title, thread.prefixid, thread.threadid, thread.forumid, thread.postuserid, thread.visible
,post.pagetext AS preview
, NOT ISNULL(subscribethread.subscribethreadid) AS issubscribed
FROM thread AS thread
LEFT JOIN post AS post ON(post.postid = thread.firstpostid)
LEFT JOIN subscribethread AS subscribethread ON(subscribethread.threadid = thread.threadid AND subscribethread.userid = 1 AND canview = 1)
WHERE thread.threadid IN (0,3667,3675,3674,2062);
MySQL Error : MySQL server has gone away
Error Number : 2006
Request Date : Sunday, November 21st 2010 @ 06:17:36 PM
Error Date : Sunday, November 21st 2010 @ 06:18:01 PM
Script : http://www.tabletennistalk.co.uk/forum/online.php
Referrer : http://www.tabletennistalk.co.uk/forum/forum.php

IP Address : #########
Username : me
Classname : vB_Database
MySQL Version :

Not all the time its very random?

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