java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at gregtech.common.tileentities.generators.GT_MetaTileEntity_SteamTurbine.getFuelValue(GT_MetaTileEntity_SteamTurbine.java:59)
at gregtech.api.metatileentity.implementations.GT_MetaTileEntity_BasicGenerator.allowPutStack(GT_MetaTileEntity_BasicGenerator.java:259)
at gregtech.api.metatileentity.MetaTileEntity.func_102007_a(MetaTileEntity.java:679)
at gregtech.api.metatileentity.BaseMetaTileEntity.func_102007_a(BaseMetaTileEntity.java:1631)
at com.enderio.core.common.util.ItemUtil.doInsertItemInv(ItemUtil.java:387)
at com.enderio.core.common.util.ItemUtil.doInsertItemInv(ItemUtil.java:375)
at com.enderio.core.common.util.ItemUtil.doInsertItem(ItemUtil.java:325)
at crazypants.enderio.conduit.item.NetworkedInventory.insertItem(NetworkedInventory.java:380)
at crazypants.enderio.conduit.item.NetworkedInventory.insertIntoTargets(NetworkedInventory.java:343)
at crazypants.enderio.conduit.item.NetworkedInventory.doTransfer(NetworkedInventory.java:257)
at crazypants.enderio.conduit.item.NetworkedInventory.transferItems(NetworkedInventory.java:226)
at crazypants.enderio.conduit.item.NetworkedInventory.onTick(NetworkedInventory.java:155)
at crazypants.enderio.conduit.item.ItemConduitNetwork.doNetworkTick(ItemConduitNetwork.java:214)
at crazypants.enderio.conduit.ConduitNetworkTickHandler.tickEnd(ConduitNetworkTickHandler.java:63)
at crazypants.enderio.conduit.ConduitNetworkTickHandler.onServerTick(ConduitNetworkTickHandler.java:47)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_187_ConduitNetworkTickHandler_onServerTick_ServerTickEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.postWithProfile(EventBus.java:179)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:620)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:444)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:719)

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