5.3.4 - ResellerClub nameserver change issue

I'm receiving the error message:

Fatal error: Call to a member function getLastTLDSegment() on a non-object in /home/<account>/public_html/whmcs/modules/registrars/resellerclub/resellerclub.php on line 0

I've applied the fix suggeted here: http://forum.whmcs.com/showthread.ph...gistration-Fix

However the issue is still present. I've opened a ticket, and awaiting reply. But I just wanted to know if it was a known issue or not.

Thanks,
Dan