http://www.icyphoenix.com/viewtopic.php?f=4&t=155&p=14398#p14398
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Mighty Gorgon
Sun 20 May, 2007 15:38

Re: [Patch] Error Creating New Session
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[quote user="diegomak" post="14311"]is heap MG, I will that with heap table this problem don't appear again but   :( 

now 1300 users  :mrgreen: 
 
thanks, for now 9999 rows works[/quote]
Convert it to MyISAM.