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

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at org.bukkit.craftbukkit.CraftWorld.isChunkInUse(
at org.bukkit.craftbukkit.CraftWorld.unloadChunkRequest(
at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(
at keepcalm.mods.bukkit.forgeHandler.SchedulerTickHandler.tickStart(
at cpw.mods.fml.common.SingleIntervalHandler.tickStart(
at cpw.mods.fml.common.FMLCommonHandler.tickStart(
at net.minecraft.server.MinecraftServer.q(

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