Bukkit

What steps will reproduce the problem?
1.It just happen without warning :D

What is the expected output? What do you see instead?
I don't see the prefixes I see the world name.

What version of the product are you using?

Don't know the name,but it's the latest ;)

Do you have an error log of what happened?

2013-07-09 11:52:41 [SEVERE] Could not pass event AsyncPlayerChatEvent to Chadmin v1.2
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
    at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:894)
    at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:846)
    at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
    at net.minecraft.server.v1_5_R3.NetworkManager.i(NetworkManager.java:210)
    at net.minecraft.server.v1_5_R3.NetworkManager.c(NetworkManager.java:346)
    at net.minecraft.server.v1_5_R3.NetworkReaderThread.run(SourceFile:94)
Caused by: java.lang.NullPointerException
    at org.efreak1996.Chadmin.Channel.Channel.chat(Channel.java:277)
    at org.efreak1996.Chadmin.ChatListener.onPlayerChat(ChatListener.java:20)
    at sun.reflect.GeneratedMethodAccessor225.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    ... 9 more

Please provide any additional information below.

Okay that's funny. The Problem is : Everytime the other Owner join the Server the normal chat start when he leave the chat with Prefix start

@Schreckens: Go

What is his prefix, also, his name?
Your config files? Channel file he's in?