NullPointerException on login

Hi there.
I've been playing a bit with Tigase 5.0.0 as my company is considering going xmpp, and Tigase seems to be one of the best options :)

I did a default install with Derby db on a Windows machine to test it out.

However, Tigase sometimes starts throwing an exception (as seen below) on each login attempt, and Tigase-Messenger gets stuck on "Authentication".
(I tried iJab too, same results)

The packet Tigase chokes on doesn't seem that malformed. And I have to admit it, I'm no java expert.

I guess I've done something wrong, but well, I haven't done much actually : Installed Tigase with default config, added two lines for bosh proxying in apache conf, and created an account or two with Pidgin.

Any thoughts ?
Thanks,
Jordan.

The error :

2010-07-19 09:35:25 WorkerThread.run()
SEVERE: Exception during packet processing: from=bosh@test/1487210e-23ca-474f-85dc-b2bab14324c0,to=sess-man@test, data=AHRlc3QzAHRlc3Qz, XMLNS=urn:ietf:params:xml:ns:xmpp-sasl, priority=NORMAL
java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:881)
at tigase.xmpp.XMPPSession.putCommonSessionData(XMPPSession.java)
at tigase.xmpp.XMPPResourceConnection.putCommonSessionData(XMPPResourceConnection.java)
at tigase.xmpp.impl.Privacy.setActiveList(Privacy.java)
at tigase.xmpp.impl.JabberIqPrivacy.allowed(JabberIqPrivacy.java)
at tigase.xmpp.impl.JabberIqPrivacy.filter(JabberIqPrivacy.java)
at tigase.server.xmppsession.SessionManager.addOutPackets(SessionManager.java)
at tigase.server.xmppsession.SessionManager$ProcessorWorkerThread.process(SessionManager.java)
at tigase.util.WorkerThread.run(WorkerThread.java)