[otrs] "Need URL or Reload!" 500 Errors in Beta 6

Is anyone else seeing these errors when closing some, but not all, tickets? [Fri Oct 29 11:49:49 2010][Error][Kernel::Output::HTML::LayoutPopup::PopupClose][57] Need URL or Reload! The ticket closes successfully but the agent is left with a server error. I already have a bug open for this,http://bugs.otrs.org/show_bug.cgi?id=6055, but am wondering if anyone else has a workaround. Hugh