Commented Unassigned: Object doesn't support this property or method IE8 [27650]

Using Ajax tabcontainer, getting error message which points to:

n._tabIndex=i.owner.get_tabs().length; when debugging from IE8 debugger.

Tabs are not showing on page, getting blanck page.

Any help most appreciate it.
Thanks

Comments: Sorry, meant to say December 2013 release has other Tab issues... September release 7.1005 is the latest stable one for Tabs (pre-jquery conversion)