id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
5163	[FF] Error when using undo	Damian		"1. Clear browser cache/cookies etc. [[BR]]
2. Open Ajax sample on nightly build [[BR]]
3. Add some content [[BR]]
4. At end of the document add a horizontal line [[BR]]
5. Attempt to undo [[BR]]

Undo doesn't work on the horizontal line and the following error occurs:

{{{
l is null
[Break on this error] return h;},clone:function(h,i){var j=thi...h){var j=this;if(h.equals(j))return j;\r\n
}}}

This only happens on the first load of the editor. "	Bug	closed	Normal	CKEditor 3.2	General	3.1	fixed	IBM Confirmed Firefox	Joek