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

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java.lang.NullPointerException:
at org.bukkit.craftbukkit.CraftWorld.isChunkInUse(CraftWorld.java:367)
at org.bukkit.craftbukkit.CraftWorld.unloadChunkRequest(CraftWorld.java:295)
at com.wimbli.WorldBorder.WorldFillTask.run(WorldFillTask.java:205)
at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:52)
at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:346)
at keepcalm.mods.bukkit.forgeHandler.SchedulerTickHandler.tickStart(SchedulerTickHandler.java:38)
at cpw.mods.fml.common.SingleIntervalHandler.tickStart(SingleIntervalHandler.java:16)
at cpw.mods.fml.common.FMLCommonHandler.tickStart(FMLCommonHandler.java:119)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:588)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at undefined.fy.run(SourceFile:849)

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