CRM 2011 this.$E_2.contentWindow.document.body' is null or not an object

We have encountered this error when doing the following steps,
1. Enter a characters for a lookup and auto resolve the data rather than selecting from lookup window
2. Save form
3. On save this error pops out.
Please visit Microsoft support (link below) to resolve the problem

http://support.microsoft.com/kb/2671694