java.lang.NullPointerException: Updating screen events

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java.lang.NullPointerException: Updating screen events
at mekanism.common.inventory.container.ContainerChemicalOxidizer.(ContainerChemicalOxidizer.java:42)
at mekanism.client.gui.GuiChemicalOxidizer.(GuiChemicalOxidizer.java:39)
at mekanism.client.ClientProxy.getClientGui(ClientProxy.java:769)
at mekanism.client.ClientProxy.getClientGui(ClientProxy.java:249)
at mekanism.common.CoreGuiHandler.getClientGuiElement(CoreGuiHandler.java:25)
at net.minecraftforge.fml.common.network.NetworkRegistry.getLocalGuiContainer(NetworkRegistry.java:273)
at mekanism.client.gui.GuiRobitMain.func_73864_a(GuiRobitMain.java:284)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:548)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:517)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1700)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1055)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:371)
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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