Помогите Краш сервера. Странный лог

Code:

java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:810)
    at java.util.HashMap$KeyIterator.next(HashMap.java:845)
    at ii.a(EntityTracker.java:314)
    at iq.j_(EntityPlayerMP.java:350)
    at yc.a(World.java:2750)
    at in.a(WorldServer.java:844)
    at yc.g(World.java:2708)
    at yc.h(World.java:2537)
    at in.h(WorldServer.java:701)
    at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:963)
    at ho.r(DedicatedServer.java:309)
    at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:864)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:751)
    at fy.run(ThreadMinecraftServer.java:16)

Вот такая ошибка... В чем причина

 

ну как дайка весь лог

 

http://mc.tort.fm/crash-2013-05-31_15.47.34-server.txt