java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at codechicken.lib.world.WorldExtension.saveChunkData(WorldExtension.java:62)
at codechicken.lib.world.WorldExtensionManager$WorldExtensionEventHandler.onChunkDataSave(WorldExtensionManager.java:42)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_316_WorldExtensionEventHandler_onChunkDataSave_Save.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75816_a(AnvilChunkLoader.java:219)
at net.minecraft.world.gen.ChunkProviderServer.func_73242_b(ChunkProviderServer.java:338)
at net.minecraft.world.gen.ChunkProviderServer.func_73151_a(ChunkProviderServer.java:418)
at org.bukkit.craftbukkit.v1_7_R4.CraftWorld.save(CraftWorld.java:791)
at com.mengcraft.bukkit.protect.SaveWorld$SaveWorldTask.run(SaveWorld.java:65)
at java.lang.Thread.run(Unknown Source)

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