This is just a guess but there is a patch in current gnome cvs:

if (GTK_WIDGET_HAS_FOCUS (widget) && GTK_WIDGET_DRAWABLE (widget) &&
-      notebook->cur_page->tab_label->window == event->window &&
-      notebook->show_tabs && notebook->cur_page)
+      notebook->show_tabs && notebook->cur_page &&
+      notebook->cur_page->tab_label->window == event->window)

And it has comment:

"(gtk_notebook_draw_focus): fix potential crasher if cur_page is NULL"

So is it possible in this case that cur_page is NULL?

** Changed in: pcmanx-gtk2 (Ubuntu)
     Assignee: (unassigned) => ville palo

-- 
Segmentation fault (core dumped) at feisty
https://launchpad.net/bugs/79449

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