2013-01-06 17:21:15 [SEVERE] Could not pass event SignChangeEvent to ChestShop v3.50t0041
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.PlayerConnection.a(PlayerConnection.java:1395)
	at net.minecraft.server.v1_4_6.Packet130UpdateSign.handle(SourceFile:46)
	at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
	at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
	at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
	at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:598)
	at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
	at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
	at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
	at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
	at net.minecraft.server.v1_4_6.Enchantment.canEnchant(Enchantment.java:98)
	at org.bukkit.craftbukkit.v1_4_6.enchantments.CraftEnchantment.canEnchantItem(CraftEnchantment.java:55)
	at org.bukkit.inventory.ItemStack.addEnchantment(ItemStack.java:415)
	at org.bukkit.inventory.ItemStack.addEnchantments(ItemStack.java:397)
	at com.Acrobot.Breeze.Utils.MaterialUtil.getItem(MaterialUtil.java:177)
	at com.Acrobot.ChestShop.Listeners.Block.SignChange.onSignChange(SignChange.java:48)
	at sun.reflect.GeneratedMethodAccessor313.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