Comment 2 for bug 723850

StacktraceTop:
 g_type_check_instance_cast (type_instance=0x8d10818, iface_type=140377248) at /build/buildd/glib2.0-2.28.1/./gobject/gtype.c:3990
 image_notify_cb (widget=0x85bac40, pspec=0x8d10818, data=0x2) at /build/buildd/libdbusmenu-0.3.99/./libdbusmenu-gtk/parser.c:665
 g_cclosure_marshal_VOID__VOID (closure=0x8cd7fe8, return_value=0x0, n_param_values=1, param_values=0x8b21e30, invocation_hint=0xbfe49450, marshal_data=0x0) at /build/buildd/glib2.0-2.28.1/./gobject/gmarshal.c:79
 g_closure_invoke (closure=0x8cd7fe8, return_value=0x0, n_param_values=1, param_values=0x8b21e30, invocation_hint=0xbfe49450) at /build/buildd/glib2.0-2.28.1/./gobject/gclosure.c:767
 signal_emit_unlocked_R (node=0x86128f0, detail=0, instance=0x85bac40, emission_return=0x0, instance_and_params=0x8b21e30) at /build/buildd/glib2.0-2.28.1/./gobject/gsignal.c:3252