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 net.minecraft.entity.player.EntityPlayer.getBreakSpeed(EntityPlayer.java:811)
at net.minecraftforge.common.ForgeHooks.blockStrength(ForgeHooks.java:138)
at net.minecraft.block.Block.func_149737_a(Block.java:643)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78743_b(PlayerControllerMP.java:177)
at net.minecraft.client.Minecraft.func_147116_af(Minecraft.java:1409)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1948)
Crash