Warnings when running on Linux

[jonhoo]

When running buzz:

$ cargo run
    Finished debug [unoptimized + debuginfo] target(s) in 0.0 secs
     Running `target/debug/buzz`

(.:12707): GLib-GIO-CRITICAL **: g_dbus_connection_register_object: assertion 'object_path != NULL && g_variant_is_object_path (object_path)' failed

(.:12707): GLib-GIO-CRITICAL **: g_dbus_connection_register_object: assertion 'object_path != NULL && g_variant_is_object_path (object_path)' failed

(.:12707): GLib-GIO-CRITICAL **: g_dbus_connection_emit_signal: assertion 'object_path != NULL && g_variant_is_object_path (object_path)' failed

(.:12707): GLib-GIO-CRITICAL **: g_dbus_connection_emit_signal: assertion 'object_path != NULL && g_variant_is_object_path (object_path)' failed

(.:12707): GLib-GIO-CRITICAL **: g_dbus_connection_emit_signal: assertion 'object_path != NULL && g_variant_is_object_path (object_path)' failed

(.:12707): Gdk-CRITICAL **: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendants_freeze_count > 0' failed

[ramizdemiurge]

I got the same problem

[qdot]

This seems to still be an issue in 0.4.0. Not sure why?