2013-06-11 20:50:41 [SEVERE] Could not pass event PlayerCommandPreprocessEvent to SimpleAlias v1.3.6
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 net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerConnection.java:957)
	at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:883)
	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 net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
	at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
	at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
	at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
	at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NullPointerException
	at com.DarkBlade12.SimpleAlias.Listener.AliasListener.onPlayerCommand(AliasListener.java:55)
	at sun.reflect.GeneratedMethodAccessor122.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)
	... 16 more