Version details: Debian package 0.8.10-1
Distribution/Version: Debian unstable

I have in my element the following:
  g_object_class_install_property (gobject_class, ARG_BUFFER,
    g_param_spec_object ("buffer", "Buffer", "Buffer to sink data to",
                          GST_TYPE_BUFFER, G_PARAM_READWRITE));

Registering this element give the following errors:
(process:25855): GLib-GObject-CRITICAL **: g_param_spec_object: assertion
`g_type_is_a (object_type, G_TYPE_OBJECT)' failed

(process:25855): GLib-GObject-CRITICAL **: g_object_class_install_property:
assertion `G_IS_PARAM_SPEC (pspec)' failed
Added plugin buffersink with 1 feature.

Replacing the type with, for example, GST_TYPE_ELEMENT makes this error go away
(but then it'll run into errors at run time since it is not what I want.)