PHP Warning after adding alert and running cron job

Hello,

Just installed v1.1rc1 and created a few users/projects.
While setting alerts for a new user and when I ran cronjob, I noticed this error on Event Log:

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Event Details
Type: Errors
Severity: Warning Warning
Date: 2013-11-07 21:35
Message: PHP Warning: Missing argument 5 for System_Api_AlertManager::addAlert(), called in X:\xampp\htdocs\xampp\webu\server\actions.inc.php on line 841 and defined in X:\xampp\htdocs\xampp\webu\system\api\alertmanager.inc.php on line 314
User name: Chris Coach
Host name: ::1
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I did not receive any alerts, when I re-run cron job, it was OK.

Just FYI if you want to take a look :)