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java.lang.NullPointerException: Ticking entity at net.minecraft.nbt.NBTTagCompound.func_74737_b(NBTTagCompound.java:356) at net.minecraft.item.ItemStack.func_77946_l(ItemStack.java:413) at net.minecraft.inventory.Container.func_75142_b(Container.java:143) at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:317) at net.minecraft.world.World.func_72866_a(World.java:2740) at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:877) at net.minecraft.world.World.func_72870_g(World.java:2678) at net.minecraft.world.World.func_72939_s(World.java:2480) at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:673) at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:986) at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:432) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:841) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:693) at java.lang.Thread.run(Thread.java:745)