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java.lang.NullPointerException: 	at slimeknights.tconstruct.library.tools.DualToolHarvestUtils.shouldUseOffhand(DualToolHarvestUtils.java:26)	at slimeknights.tconstruct.library.tools.TinkerToolCore.getHarvestLevel(TinkerToolCore.java:56)	at net.minecraftforge.common.ForgeHooks.canToolHarvestBlock(ForgeHooks.java:187)	at com.vanhal.progressiveautomation.entities.miner.TileMiner.canMineBlock(TileMiner.java:131)	at com.vanhal.progressiveautomation.entities.miner.TileMiner.scanBlocks(TileMiner.java:90)	at com.vanhal.progressiveautomation.entities.miner.TileMiner.checkForChanges(TileMiner.java:428)	at com.vanhal.progressiveautomation.entities.miner.TileMiner.func_73660_a(TileMiner.java:67)	at net.minecraft.world.World.func_72939_s(World.java:1804)	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:619)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:709)	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)	at java.lang.Thread.run(Thread.java:745)