javascript - "Unknown runtime error" in IE

Question

I'm using Facebook JS SDK and it's working perfectly in all browsers except Internet explorer 7/8 (of course). Console outputs the following error:

Unknown runtime error: all.js, line 128 character 3067

Line 128, character 3067 points to this in all.js:

this._element.innerHTML='';

Any ideas? Thanks.

Edit: HTML surrounding login button: http://pastebin.com/ZSeMgRiJ