conflict between jQuery UI Tabs 1.8.16 & Thickbox 3.1 (3.3 beta 3)

[arena]

This is not a wordpress bug
but for my plugin (MailPress)

when trying to close the tb iframe, a js error occurs and screen remains grey

see screenshot attached

JS error when previewing a MailPress form in Firefox 8:

Error: a.lis is null
Source File: wp-includes/js/jquery/ui/jquery.ui.tabs.min.js?ver=1.8.16
Line: 20

Sounds like a duplicate of #19189. The a.lis reference is used in a callback bound to the unload event on window.

From ​jquery.ui.tabs.js:

$( window ).bind( "unload" ... self.lis.add( self.anchors ).unbind( ".tabs" )

though this actually seems to be gone in the master branch.

Replying to duck_:

Sounds like a duplicate of #19189.