MidiBanks Error

16:12:25 [SEVERE] Could not pass event ChunkLoadEvent to MidiBanks v1.9
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_4_6.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:139)
	at net.minecraft.server.v1_4_6.ChunkProviderServer.getChunkAt(ChunkProviderServer.java:85)
	at net.minecraft.server.v1_4_6.PlayerList.a(PlayerList.java:127)
	at net.minecraft.server.v1_4_6.PlayerList.c(PlayerList.java:171)
	at net.minecraft.server.v1_4_6.PlayerList.a(PlayerList.java:95)
	at net.minecraft.server.v1_4_6.PendingConnection.d(PendingConnection.java:130)
	at net.minecraft.server.v1_4_6.PendingConnection.c(PendingConnection.java:45)
	at net.minecraft.server.v1_4_6.DedicatedServerConnectionThread.a(DedicatedServerConnectionThread.java:44)
	at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:29)
	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:585)
	at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
	at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:481)
	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:416)
	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
	at org.bukkit.craftbukkit.v1_4_6.block.CraftSign.<init>(CraftSign.java:17)
	at org.bukkit.craftbukkit.v1_4_6.block.CraftBlock.getState(CraftBlock.java:242)
	at org.bukkit.craftbukkit.v1_4_6.CraftChunk.getTileEntities(CraftChunk.java:117)
	at net.myshelter.minecraft.midibanks.MidiBanksListeners.onChunkLoaded(MidiBanksListeners.java:42)
	at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
	... 17 more