Comment 2 for bug 851954

StacktraceTop:
 g_type_check_instance_cast (type_instance=0x921dca0, iface_type=147557224) at /build/buildd/glib2.0-2.29.90/./gobject/gtype.c:3977
 gtk_menu_popdown (menu=0x921dca0) at /build/buildd/gtk+3.0-3.1.90/./gtk/gtkmenu.c:1808
 gtk_menu_deactivate (menu_shell=0x921dca0) at /build/buildd/gtk+3.0-3.1.90/./gtk/gtkmenu.c:4636
 g_cclosure_marshal_VOID__VOID (closure=0x8cb8888, return_value=0x0, n_param_values=1, param_values=0x954c3c0, invocation_hint=0xbf502210, marshal_data=0xb7460e50) at /build/buildd/glib2.0-2.29.90/./gobject/gmarshal.c:85
 g_type_class_meta_marshal (closure=0x8cb8888, return_value=0x0, n_param_values=1, param_values=0x954c3c0, invocation_hint=0xbf502210, marshal_data=0x1ec) at /build/buildd/glib2.0-2.29.90/./gobject/gclosure.c:885