Crash in MP while doing nothing

[Qwertygiy]

Code:

java.lang.NullPointerException
net.buildism.object.AbstractCharacter.step(AbstractCharacter.java:382)
net.buildism.World.step(World.java:784)
net.buildism.Game.step(Game.java:264)
net.buildism.Main.gameStep(Main.java:648)
net.buildism.MainApplet.run(MainApplet.java:235)
java.lang.Thread.run(Unknown Source)

I was the only one in the server at the time, and I didn't even have the window up front -- I was working on something else.