Error

2013-04-18 18:14:01 [SEVERE] Could not pass event NameTagReceiveEvent to NameTagAPI v1.4.1
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:462)
	at com.haribo98.nametag.Main.callEvent(Main.java:108)
	at com.haribo98.nametag.Events.onTeleport(Events.java:27)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.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)
	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:462)
	at net.minecraft.server.v1_5_R2.PlayerConnection.a(PlayerConnection.java:436)
	at net.minecraft.server.v1_5_R2.PlayerList.a(PlayerList.java:101)
	at net.minecraft.server.v1_5_R2.PendingConnection.d(PendingConnection.java:129)
	at net.minecraft.server.v1_5_R2.PendingConnection.c(PendingConnection.java:44)
	at net.minecraft.server.v1_5_R2.DedicatedServerConnectionThread.a(DedicatedServerConnectionThread.java:41)
	at net.minecraft.server.v1_5_R2.DedicatedServerConnection.b(SourceFile:29)
	at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:580)
	at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:225)
	at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:476)
	at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:409)
	at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
	at com.haribo98.nametag.Main.isNameColour(Main.java:23)
	at com.haribo98.nametag.Events.onReceive(Events.java:104)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.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)
	... 24 more