java.lang.NullPointerException: Updating screen events

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java.lang.NullPointerException: Updating screen events
at mcjty.rftools.items.storage.StorageFilterInventory.func_70296_d(StorageFilterInventory.java:114)
at mcjty.rftools.items.storage.StorageFilterInventory.func_70299_a(StorageFilterInventory.java:86)
at mcjty.lib.container.GhostSlot.func_75215_d(GhostSlot.java:42)
at mcjty.lib.container.GenericContainer.func_75144_a(GenericContainer.java:279)
at codechicken.nei.guihook.GuiContainerManager.handleSlotClick(GuiContainerManager.java:504)
at net.minecraft.client.gui.inventory.GuiContainer.func_146984_a(GuiContainer.java:638)
at codechicken.nei.guihook.DefaultSlotClickHandler.callHandleMouseClick(DefaultSlotClickHandler.java)
at codechicken.nei.guihook.DefaultSlotClickHandler.handleSlotClick(DefaultSlotClickHandler.java:17)
at codechicken.nei.guihook.GuiContainerManager.handleMouseClick(GuiContainerManager.java:453)
at net.minecraft.client.gui.inventory.GuiContainer.managerHandleMouseClick(GuiContainer.java)
at mcjty.lib.container.GenericGuiContainer.func_146286_b(GenericGuiContainer.java:92)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:306)
at mcjty.lib.container.GenericGuiContainer.func_146274_d(GenericGuiContainer.java:85)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

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