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java.lang.NullPointerException: Ticking entity at net.minecraft.nbt.NBTTagCompound.func_74737_b( at net.minecraft.item.ItemStack.func_77946_l( at net.minecraft.inventory.Container.func_75142_b( at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_( at at at at at at net.minecraft.server.MinecraftServer.func_71190_q( at net.minecraft.server.dedicated.DedicatedServer.func_71190_q( at net.minecraft.server.MinecraftServer.func_71217_p( at at