java.lang.NullPointerException: Updating screen events
	at net.minecraft.item.ItemSlab.func_77667_c(SourceFile:37)
	at net.minecraft.item.Item.func_77657_g(Item.java:547)
	at net.minecraft.item.Item.func_77653_i(Item.java:636)
	at net.minecraft.item.ItemStack.func_82833_r(ItemStack.java:427)
	at darkknight.jewelrycraft.item.ItemMoltenMetalBucket.func_77653_i(ItemMoltenMetalBucket.java:222)
	at net.minecraft.item.ItemStack.func_82833_r(ItemStack.java:427)
	at net.minecraft.item.ItemStack.func_82840_a(ItemStack.java:489)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.updateFilteredItems(GuiContainerCreative.java:378)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147053_i(GuiContainerCreative.java:335)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147050_b(GuiContainerCreative.java:550)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146286_b(GuiContainerCreative.java:456)
	at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:306)
	at net.minecraft.client.gui.inventory.GuiContainer.func_146274_d(GuiContainer.java)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146274_d(GuiContainerCreative.java:566)
	at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268)
	at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1628)
	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:961)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
	at net.minecraft.client.main.Main.main(SourceFile:148)
	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:497)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at net.minecraft.item.ItemSlab.func_77667_c(SourceFile:37)
	at net.minecraft.item.Item.func_77657_g(Item.java:547)
	at net.minecraft.item.Item.func_77653_i(Item.java:636)
	at net.minecraft.item.ItemStack.func_82833_r(ItemStack.java:427)
	at darkknight.jewelrycraft.item.ItemMoltenMetalBucket.func_77653_i(ItemMoltenMetalBucket.java:222)
	at net.minecraft.item.ItemStack.func_82833_r(ItemStack.java:427)
	at net.minecraft.item.ItemStack.func_82840_a(ItemStack.java:489)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.updateFilteredItems(GuiContainerCreative.java:378)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147053_i(GuiContainerCreative.java:335)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147050_b(GuiContainerCreative.java:550)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146286_b(GuiContainerCreative.java:456)
	at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:306)
	at net.minecraft.client.gui.inventory.GuiContainer.func_146274_d(GuiContainer.java)
	at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146274_d(GuiContainerCreative.java:566)
	at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268)

-- Affected screen --
Details:
	Screen name: net.minecraft.client.gui.inventory.GuiContainerCreative