(kiba-dock:9841): GLib-GObject-WARNING **: invalid unclassed pointer in cast to `KibaObject'

(kiba-dock:9841): GLib-GObject-WARNING **: invalid unclassed pointer in cast to `GtkWidget'

(kiba-dock:9841): GLib-GObject-CRITICAL **: g_type_instance_get_private: assertion `instance != NULL && instance->g_class != NULL' failed
Segmentation fault (core dumped)