Comment 2 for bug 1053944

StacktraceTop:
 g_type_check_instance_cast (type_instance=type_instance@entry=0x7fcd4a29fc60, iface_type=140519687843792) at /build/buildd/glib2.0-2.33.14/./gobject/gtype.c:3997
 settings_notify_cb (settings=0x7fcd49db3000, pspec=0x7fcd4a5d1f20, data=0x7fcd4a29fc60) at /build/buildd/libdbusmenu-12.10.1/./libdbusmenu-gtk/parser.c:1327
 g_closure_invoke (closure=0x7fcd4a47e7c0, return_value=0x0, n_param_values=2, param_values=0x7fffe3115a70, invocation_hint=0x7fffe3115a10) at /build/buildd/glib2.0-2.33.14/./gobject/gclosure.c:777
 signal_emit_unlocked_R (node=node@entry=0x7fcd49d90430, detail=detail@entry=3828, instance=instance@entry=0x7fcd49db3000, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffe3115a70) at /build/buildd/glib2.0-2.33.14/./gobject/gsignal.c:3551
 g_signal_emit_valist (instance=0x7fcd49db3000, signal_id=<optimized out>, detail=3828, var_args=var_args@entry=0x7fffe3115cc8) at /build/buildd/glib2.0-2.33.14/./gobject/gsignal.c:3300