AppleODClient - _pws_get_policy: parameter named "account_id_str" is NULL

I'm getting these messages on my Lion server recently. The events prior to this appearing in my opendirectory.log was:

* Setting up a second Lion server for mainly running the PodcastProducer service.

* Binding this server to the OD (not making a replica, just "System Preferences/Users & Groups/Login Options/Network Account Server"

* Starting the PodcastProducer which also sets up the XGrid and creates a user in the OpenDirectory.

The same message appears now when I am connecting to the OpenDirectory using Workgroup Manager.

I already tried searching for this but I couldn't find information about this anywhere on the net. Does someone know why this happens, where it does come from and whether it is something I have to worry about (It appears several times per minute if the PodcastProducer is switched on (right now I deactivated it in order to avoid something to break)?

Thank you very in advance!

2011-11-17 14:45:39.058 JST - 49335.3249612 - Client: Workgroup Manag, UID: 501, EUID: 501, GID: 20, EGID: 20

2011-11-17 14:45:39.058 JST - 49335.3249612, Node: /LDAPv3/127.0.0.1, Module: AppleODClient - _pws_get_policy: parameter named "account_id_str" is NULL

2011-11-17 14:50:29.860 JST - 115.3251014 - Client: kdc, UID: 0, EUID: 0, GID: 0, EGID: 0

2011-11-17 14:50:29.860 JST - 115.3251014, Node: /LDAPv3/ldapi://%2Fvar%2Frun%2Fldapi, Module: AppleODClient - _pws_get_policy: parameter named "account_id_str" is NULL