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This crashed the job queue for test2wiki:

2013-02-12 18:03:38 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(10) STARTING
2013-02-12 18:03:39 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(10) t=673 error=
2013-02-12 18:03:39 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(10) STARTING
2013-02-12 18:03:39 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(10) t=11 error=
2013-02-12 18:03:39 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(12) STARTING
2013-02-12 18:03:39 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(12) t=17 error=
2013-02-12 18:03:39 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(10) STARTING
2013-02-12 18:03:39 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(10) t=9 error=
2013-02-12 18:03:40 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(11) STARTING
2013-02-12 18:03:40 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(11) t=11 error=
2013-02-12 18:03:40 ChangeNotification Special:ChangeNotificationJob repo= changeIds=array(12) STARTING
Failed to load revision 6356493 of q1056299
Backtrace:
#0 /home/wikipedia/common/php-1.21wmf9/extensions/Wikibase/client/includes/ChangeHandler.php(250): Wikibase\ChangeHandler->mergeChanges(Array)
#1 /home/wikipedia/common/php-1.21wmf9/extensions/Wikibase/client/includes/ChangeHandler.php(270): Wikibase\ChangeHandler->coalesceRuns(Array)
#2 /home/wikipedia/common/php-1.21wmf9/extensions/Wikibase/client/includes/ChangeHandler.php(312): Wikibase\ChangeHandler->coalesceChanges(Array)
#3 /home/wikipedia/common/php-1.21wmf9/extensions/Wikibase/lib/includes/ChangeNotificationJob.php(132): Wikibase\ChangeHandler->handleChanges(Array)
#4 /home/wikipedia/common/php-1.21wmf9/maintenance/runJobs.php(87): Wikibase\ChangeNotificationJob->run()
#5 /home/wikipedia/common/php-1.21wmf9/maintenance/doMaintenance.php(110): RunJobs->execute()
#6 /home/wikipedia/common/php-1.21wmf9/maintenance/runJobs.php(122): require_once('/home/wikipedia...')
#7 /home/wikipedia/common/multiversion/MWScript.php(74): require_once('/home/wikipedia...')
#8 {main}