(<unknown>:3545): Gtk-CRITICAL **: IA__gtk_widget_unrealize: assertion `GTK_IS_WIDGET (widget)' failed

(<unknown>:3545): Gtk-CRITICAL **: IA__gtk_widget_is_toplevel: assertion `GTK_IS_WIDGET (widget)' failed
opera [crash logging]: CRASH!!
/usr/lib/opera/opera got signal SIGSEGV at address 7FE9B5876D18

Log was created here:
/var/tmp/crash20111108163047.txt
Killed
nik@kokiri:~$
(<unknown>:3549): Gtk-CRITICAL **: IA__gtk_widget_unrealize: assertion `GTK_IS_WIDGET (widget)' failed

(<unknown>:3549): Gtk-CRITICAL **: IA__gtk_widget_is_toplevel: assertion `GTK_IS_WIDGET (widget)' failed