IPL Error

2012-12-11 16:16:45 [SEVERE] Could not pass event PlayerJoinEvent to IPL v1.0.5
org.bukkit.event.EventException

	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:341)

	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.ServerConfigurationManagerAbstract.c(ServerConfigurationManagerAbstract.java:153)

	at net.minecraft.server.ServerConfigurationManagerAbstract.a(ServerConfigurationManagerAbstract.java:93)

	at net.minecraft.server.NetLoginHandler.d(NetLoginHandler.java:132)

	at net.minecraft.server.NetLoginHandler.c(NetLoginHandler.java:45)

	at net.minecraft.server.DedicatedServerConnectionThread.a(DedicatedServerConnectionThread.java:44)

	at net.minecraft.server.DedicatedServerConnection.b(SourceFile:29)

	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)

	at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)

	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)

	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)

	at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)

Caused by: java.lang.NullPointerException

	at de.mc_zone.ipl.IPLock.normalJoin(IPLock.java:144)

	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:339)

	... 14 more