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Sudden error in admin area (Warning: Invalid argument supplied for foreach in Feed.php on line 84 )

We are receiving some requests regarding the following error:
Warning: Invalid argument supplied for foreach() 
in /app/code/core/Mage/AdminNotification/Model/Feed.php on line 84

I'd like to let you know that the is down at the moment and this causes the error. It comes from the Admin Notifications native module.
We have nothing to do with this.