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WCF::destruct() Unhandled exception: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away

#0 /hp/ab/ae/iq/www/wcf/lib/data/DatabaseObjectEditor.class.php(68): wcf\system\database\Database->prepareStatement('UPDATE\twcf1_ses...')
#1 /hp/ab/ae/iq/www/wcf/lib/data/acp/session/ACPSessionEditor.class.php(42): wcf\data\DatabaseObjectEditor->update(Array)
#2 /hp/ab/ae/iq/www/wcf/lib/system/session/SessionHandler.class.php(857): wcf\data\acp\session\ACPSessionEditor->update(Array)
#3 /hp/ab/ae/iq/www/wcf/lib/system/WCF.class.php(175): wcf\system\session\SessionHandler->update()
#4 [internal function]: wcf\system\WCF::destruct()
#5 {main}