java.lang.NullPointerException: Unexpected error

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java.lang.NullPointerException: Unexpected error
at gregtech.common.tools.GT_Tool_Axe.isMinableBlock(GT_Tool_Axe.java:83)
at gregtech.api.items.GT_MetaGenerated_Tool.getDigSpeed(GT_MetaGenerated_Tool.java:438)
at gregtech.api.items.GT_MetaGenerated_Tool.canHarvestBlock(GT_MetaGenerated_Tool.java:443)
at net.minecraft.item.ItemStack.func_150998_b(ItemStack.java:319)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78743_b(PlayerControllerMP.java:153)
at net.minecraft.client.Minecraft.func_147116_af(Minecraft.java:1409)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1948)
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)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:310)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:395)
at org.multimc.EntryPoint.listen(EntryPoint.java:170)
at org.multimc.EntryPoint.main(EntryPoint.java:54)

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