2012-06-26 20:34:52 [SEVERE] Could not pass event InventoryCloseEvent to Backpack
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:304)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:460)
	at net.minecraft.server.NetServerHandler.handleContainerClose(NetServerHandler.java:1049)
	at net.minecraft.server.Packet101CloseWindow.handle(SourceFile:16)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:113)
	at org.getspout.spout.SpoutNetServerHandler.a(SpoutNetServerHandler.java:172)
	at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:567)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:459)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.NullPointerException
	at com.almuramc.backpack.bukkit.listener.BackpackListener.onBackpackClose(BackpackListener.java:100)
	at com.almuramc.backpack.bukkit.listener.BackpackListener.onInventoryClose(BackpackListener.java:52)
	at sun.reflect.GeneratedMethodAccessor102.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:302)
	... 11 more