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

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java.lang.NullPointerException:
at net.minecraft.server.management.PlayerChunkMapEntry.accept(SourceFile:74)
at net.minecraftforge.common.chunkio.ChunkIOProvider.runCallbacks(ChunkIOProvider.java:128)
at net.minecraftforge.common.chunkio.ChunkIOProvider.syncCallback(ChunkIOProvider.java:85)
at net.minecraft.server.MinecraftServer.tickChunkLoader(SourceFile:39)
at net.minecraft.server.MinecraftServer.func_71190_q(SourceFile:139)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(SourceFile:338)
at net.minecraft.server.MinecraftServer.func_71217_p(SourceFile:554)
at java.lang.Thread.run(Unknown Source)

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