012-05-27 12:48:43 [SEVERE] Could not pass event PlayerQuitEvent to JumboCombatLog
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:303)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:459)
	at net.minecraft.server.ServerConfigurationManager.disconnect(ServerConfigurationManager.java:179)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:698)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:234)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
	at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:551)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:449)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.IllegalArgumentException: Cannot drop a Null item.
	at org.apache.commons.lang.Validate.notNull(Validate.java:203)
	at org.bukkit.craftbukkit.CraftWorld.dropItem(CraftWorld.java:310)
	at org.bukkit.craftbukkit.CraftWorld.dropItemNaturally(CraftWorld.java:329)
	at de.bananaco.jumbo.CombatLog.drop(CombatLog.java:61)
	at de.bananaco.jumbo.CombatLog.onPlayerQuit(CombatLog.java:49)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:616)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301)
	... 10 more