Comment 2 for bug 1053849

StacktraceTop:
 g_type_check_instance_cast (type_instance=type_instance@entry=0x26ccea0, iface_type=40665488) at /build/buildd/glib2.0-2.33.14/./gobject/gtype.c:3997
 settings_notify_cb (settings=0x256aa30, pspec=0x256a940, data=0x26ccea0) at /build/buildd/libdbusmenu-12.10.1/./libdbusmenu-gtk/parser.c:1327
 g_closure_invoke (closure=0x26d9b80, return_value=0x0, n_param_values=2, param_values=0x7fffe634ee60, invocation_hint=0x7fffe634ee00) at /build/buildd/glib2.0-2.33.14/./gobject/gclosure.c:777
 signal_emit_unlocked_R (node=node@entry=0x251a030, detail=detail@entry=657, instance=instance@entry=0x256aa30, emission_return=emission_return@entry=0x0, instance_and_params=instance_and_params@entry=0x7fffe634ee60) at /build/buildd/glib2.0-2.33.14/./gobject/gsignal.c:3551
 g_signal_emit_valist (instance=0x256aa30, signal_id=<optimized out>, detail=657, var_args=var_args@entry=0x7fffe634f0b8) at /build/buildd/glib2.0-2.33.14/./gobject/gsignal.c:3300