Created attachment 3492 Fix. xfce4-session may crash if the save timeout for a client is triggered. (xfce4-session:6346): GLib-GObject-WARNING **: invalid uninstantiatable type `(null)' in cast to `GObject' (xfce4-session:6346): GLib-GObject-CRITICAL **: g_object_steal_data: assertion `G_IS_OBJECT (object)' failed
Pushed to git master and to xfce-4.8 branch, thanks a lot for your contribution!