gtk_widget_unparent: assertion 'GTK_IS_WIDGET (widget)' failed with --quit option
$ gnome-software --quit
11:12:32:453 GLib-GIO g_task_return_error: assertion '!task->ever_returned' failed
11:12:32:475 Gtk gtk_widget_unparent: assertion 'GTK_IS_WIDGET (widget)' failed