java.lang.NullPointerException: Updating screen events

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java.lang.NullPointerException: Updating screen events
at lance5057.tDefense.core.tools.modifiers.Thaumcraft.modifierRepairVis.matches(modifierRepairVis.java:32)
at tconstruct.library.crafting.ModifyBuilder.modifyItem(ModifyBuilder.java:25)
at tconstruct.tools.logic.ToolForgeLogic.buildTool(ToolForgeLogic.java:49)
at tconstruct.tools.logic.ToolStationLogic.func_70296_d(ToolStationLogic.java:65)
at net.minecraft.inventory.Slot.func_75218_e(Slot.java:83)
at cofh.lib.util.helpers.InventoryHelper.mergeItemStack(InventoryHelper.java:360)
at tconstruct.tools.inventory.ToolStationContainer.func_82846_b(ToolStationContainer.java:119)
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 tconstruct.tools.gui.ToolStationGui.func_73864_a(ToolStationGui.java:69)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:296)
at net.minecraft.client.gui.inventory.GuiContainer.func_146274_d(GuiContainer.java)
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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