Comment 2 for bug 1213813

StacktraceTop:
 g_type_check_instance_cast (type_instance=type_instance@entry=0xb7bfe030, iface_type=3082738912) at /build/buildd/glib2.0-2.37.5/./gobject/gtype.c:4008
 notify_show_window (window=window@entry=0xb7bfe030) at xfce4-notifyd/xfce-notify-daemon.c:871
 g_idle_dispatch (source=source@entry=0xb7bd79f8, callback=0xb77bcbd0 <notify_show_window>, user_data=0xb7bfe030) at /build/buildd/glib2.0-2.37.5/./glib/gmain.c:5250
 g_main_dispatch (context=0xb7bc9a08) at /build/buildd/glib2.0-2.37.5/./glib/gmain.c:3065
 g_main_context_dispatch (context=context@entry=0xb7bc9a08) at /build/buildd/glib2.0-2.37.5/./glib/gmain.c:3641