CMDHELPER-2668 - Reported by PseudoKnight

If you click in your inventory slots when accessing an anvil the following stacktrace occurs.

{{2013-05-03 06:34:46 [SEVERE] Could not pass event InventoryClickEvent to CommandHelper v1482-e7b03d6
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at net.minecraft.server.v1_5_R2.PlayerConnection.a(PlayerConnection.java:1177)
at net.minecraft.server.v1_5_R2.Packet102WindowClick.handle(SourceFile:31)
at net.minecraft.server.v1_5_R2.NetworkManager.b(NetworkManager.java:292)
at net.minecraft.server.v1_5_R2.PlayerConnection.d(PlayerConnection.java:110)
at net.minecraft.server.v1_5_R2.ServerConnection.b(SourceFile:35)
at net.minecraft.server.v1_5_R2.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:580)
at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:225)
at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:476)
at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:409)
at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 2
at net.minecraft.server.v1_5_R2.InventorySubcontainer.getItem(InventorySubcontainer.java:21)
at org.bukkit.craftbukkit.v1_5_R2.inventory.CraftInventory.getItem(CraftInventory.java:49)
at com.laytonsmith.abstraction.bukkit.BukkitMCInventory.getItem(BukkitMCInventory.java:36)
at com.laytonsmith.core.events.drivers.InventoryEvents$inventory_click.evaluate(InventoryEvents.java:95)
at com.laytonsmith.core.events.EventUtils.FireListeners(EventUtils.java:204)
at com.laytonsmith.core.events.EventUtils.TriggerListener(EventUtils.java:193)
at com.laytonsmith.abstraction.bukkit.events.drivers.BukkitInventoryListener.onInvClick(BukkitInventoryListener.java:26)
at sun.reflect.GeneratedMethodAccessor71.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)
... 14 more}}

I'm guessing it's related to this recent commit:
4b8e151#L16R91

Comment by jb_aero

And related to this issue: Bukkit/CraftBukkit#1130

Comment by LadyCailin

Closing, since this is a bukkit issue.