GLib-GObject-CRITICAL **: g_object_steal_qdata: assertion `G_IS_OBJECT (object)'
 failed during global destruction.
GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' faile
d during global destruction.
GLib-GObject-CRITICAL **: g_object_steal_qdata: assertion `G_IS_OBJECT (object)'
 failed, <GEN4> line 9 during global destruction.
GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' faile
d, <GEN4> line 9 during global destruction.