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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