Comment 2 for bug 948667

StacktraceTop:
 gtk_widget_pop_verify_invariants (widget=0x1033130) at /build/buildd/gtk+3.0-3.3.18/./gtk/gtkwidget.c:8713
 gtk_widget_real_unrealize (widget=0xf2c7e0) at /build/buildd/gtk+3.0-3.3.18/./gtk/gtkwidget.c:10512
 _g_closure_invoke_va (closure=0xef6470, return_value=0x0, instance=0xf2c7e0, args=0x7fff67cc9a78, n_params=0, param_types=<optimized out>) at /build/buildd/glib2.0-2.31.20/./gobject/gclosure.c:840
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=0, var_args=<optimized out>) at /build/buildd/glib2.0-2.31.20/./gobject/gsignal.c:3206
 g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.31.20/./gobject/gsignal.c:3352