2013-05-12 19:28:00 [SEVERE] Could not pass event PlayerCommandPreprocessEvent to cIP v0.6.0
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.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:26)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
	at net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerConnection.java:970)
	at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:895)
	at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:840)
	at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
	at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:191)
	at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
	at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
	at org.spigotmc.MultiplexingServerConnection.b(MultiplexingServerConnection.java:72)
	at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:583)
	at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:224)
	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:472)
	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:404)
	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.IllegalArgumentException: Command cannot be empty
	at org.apache.commons.lang.Validate.notEmpty(Validate.java:363)
	at org.bukkit.event.player.PlayerCommandPreprocessEvent.setMessage(PlayerCommandPreprocessEvent.java:62)
	at me.PS.cIP.cIP.onPlayerCommandPreprocess(cIP.java:538)
	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)
	... 17 more