java.lang.NullPointerException: Updating screen events

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java.lang.NullPointerException: Updating screen events
at net.minecraft.item.ItemSlab.func_77667_c(SourceFile:37)
at cofh.thermaldynamics.item.ItemCover.func_77653_i(ItemCover.java:84)
at net.minecraft.item.ItemStack.func_82833_r(ItemStack.java:427)
at net.minecraft.client.gui.inventory.GuiContainerCreative.updateFilteredItems(GuiContainerCreative.java:378)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147053_i(GuiContainerCreative.java:350)
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:1640)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
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)

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