I've got this problem in the loader at 90% running on Firefox. I set the window focus to the canvas in my pause/unpause functions in jQuery code but the live version doesn't handle that well.

Firebug traces the error to line 110 in game.min.js
// lib/impact/system.js
TypeError: this.delegate is null
[Break On This Error] 	
...(this.newGameClass);this.newGameClass=null;}},getDrawPos:null});ig.System.DRAW={..