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

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java.lang.NullPointerException:
at mytown.protection.ProtectionManager.checkExist(ProtectionManager.java:123)
at mytown.protection.ProtectionHandlers.checkSpawn(ProtectionHandlers.java:461)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_91_ProtectionHandlers_checkSpawn_CheckSpawn.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at drzhark.customspawner.CustomSpawner.performWorldGenSpawning(CustomSpawner.java:790)
at drzhark.customspawner.EventHooks.peformCustomWorldGenSpawning(EventHooks.java:51)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_52_EventHooks_peformCustomWorldGenSpawning_Populate.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:400)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:279)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1055)
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:190)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:265)
at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:235)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:258)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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