Database Error help

[BudLeiser]

Database error in vBulletin 3.6.4:

Invalid SQL:

UPDATE session
SET lastactivity = 1172789859, inforum = 0, inthread = 0, incalendar = 0, badlocation = 0, useragent = 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; InfoPath.1; .NET CLR 2.0.50727)'
WHERE sessionhash = '21316e6ca5a28b813a9d72cd8b0c2fd3';

MySQL Error : MySQL server has gone away
Error Number : 2006
Date : Thursday, March 1st 2007 @ 02:58:39 PM
Script : http://localgaming.net/forums/
Referrer : http://localgaming.net/forums/
IP Address : 192.91.171.42
Username : Unregistered
Classname : vB_Database

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I just switched servers. The host copied the files for me. Amazingly there was no downtime. Obviously I expect some kind of problem to pop up

Any clue what's wrong?