[SOLVED] NullPointerException when PLAYER_INTERACT event gets fired

Hi there,

Ive got a problem with a PlayerListener and dont know if the problem is caused by me or CraftBukkit (612).

In my MainClass I register the event:
this._pm.registerEvent(Event.Type.PLAYER_INTERACT, this._playerListener, Event.Priority.High, this);

(_pm is the PluginManager)

I have an PlayerListener class with the method:
public void onPlayerInteract( PlayerInteractEvent event )

When playing minecraft and interacting with a chest I see in the server console that the event gets fired.
However it results in a NullPointerException:
2011-04-01 04:38:24 [SEVERE] Could not pass event PLAYER_INTERACT to JustATest java.lang.NullPointerException

What am I doing wrong? Or is it CraftBukkit thats causing the problem?

I can see the same exception for BigBrother, when I right-click a chest:
2011-04-01 04:38:24 [SEVERE] Could not pass event PLAYER_INTERACT to BigBrother
java.lang.NullPointerException

Oh, feeling tremendous stupid.. Forgot to initialize the listener.
Nevermind, long nights do strange things to peoples minds.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.