Better Builders Wands - Crash

java.lang.NullPointerException: Unexpected error
	at net.minecraft.item.ItemStack.func_77981_g(ItemStack.java:234)
	at portablejim.bbw.shims.BasicPlayerShim.getBlockMeta(BasicPlayerShim.java:33)
	at portablejim.bbw.shims.BasicPlayerShim.countItems(BasicPlayerShim.java:53)
	at portablejim.bbw.core.WandWorker.getProperItemStack(WandWorker.java:49)
	at portablejim.bbw.core.BlockEvents.blockHighlightEvent(BlockEvents.java:52)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_508_BlockEvents_blockHighlightEvent_DrawBlockHighlightEvent.invoke(.dynamic)
	at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
	at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:185)
	at net.minecraftforge.client.ForgeHooksClient.onDrawBlockHighlight(ForgeHooksClient.java:161)
	at net.minecraft.client.renderer.EntityRenderer.func_175068_a(EntityRenderer.java:1329)
	at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1229)
	at net.minecraft.client.renderer.EntityRenderer.func_181560_a(EntityRenderer.java:1038)
	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1076)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:371)
	at net.minecraft.client.main.Main.main(SourceFile:124)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)