Помогите Проблема с мирами на сервере

Всем привет, вот такая вот ошибочка. Даже 3 сервер крашится раз в 1-2 дня с причиной

java.lang.IndexOutOfBoundsException: Index: 4, Size: 4

at java.util.ArrayList.rangeCheck(ArrayList.java:604)
at java.util.ArrayList.remove(ArrayList.java:445)
at net.minecraft.server.v1_5_R3.World.tickEntities(World.java:1323)
at net.minecraft.server.v1_5_R3.WorldServer.tickEntities(WorldServer.java:522)
at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:562)
at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:227)
at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:472)
at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:404)
at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at java.util.ArrayList.rangeCheck(ArrayList.java:604)
at java.util.ArrayList.remove(ArrayList.java:445)
at net.minecraft.server.v1_5_R3.World.tickEntities(World.java:1323)
at net.minecraft.server.v1_5_R3.WorldServer.tickEntities(WorldServer.java:522)

-- Affected level --
Details:
Level name: world4
All players: 0 total; []
Chunk stats: ServerChunkCache: 269 Drop: 13
Level seed: 6938358163719280732
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (35,40,0), Chunk: (at 3,2,0 in 2,0; contains blocks 32,0,0 to 47,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 128944550 game time, 154235798 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 63905 (now: false), thunder time: 113025 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:562)
at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:227)
at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:472)
at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:404)
at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)

И каждый раз крашится с разным миром, миров 12, в чём может быть проблемма?