Server crash. Pls help!

[HendRoox]

2014-08-12 15:58:59 [SEVERE] java.util.ConcurrentModificationException
2014-08-12 15:58:59 [SEVERE] 	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
2014-08-12 15:58:59 [SEVERE] 	at java.util.ArrayList$Itr.next(Unknown Source)
2014-08-12 15:58:59 [SEVERE] 	at net.minecraft.server.World.getTileEntity(World.java:1644)
2014-08-12 15:58:59 [SEVERE] 	at net.minecraft.server.WorldServer.getTileEntity(WorldServer.java:45)
2014-08-12 15:58:59 [SEVERE] 	at eloraam.core.TubeLib.isConSide(TubeLib.java:303)
2014-08-12 15:58:59 [SEVERE] 	at eloraam.core.TubeLib.getConnections(TubeLib.java:365)
2014-08-12 15:58:59 [SEVERE] 	at eloraam.core.TubeFlow$TubeScheduleContext.<init>(TubeFlow.java:23)
2014-08-12 15:58:59 [SEVERE] 	at eloraam.core.TubeFlow.update(TubeFlow.java:52)
2014-08-12 15:58:59 [SEVERE] 	at eloraam.machine.TileTube.q_(TileTube.java:227)
2014-08-12 15:58:59 [SEVERE] 	at net.minecraft.server.World.tickEntities(World.java:1190)
2014-08-12 15:58:59 [SEVERE] 	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:569)
2014-08-12 15:58:59 [SEVERE] 	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)
2014-08-12 15:58:59 [SEVERE] 	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
2014-08-12 15:58:59 [SEVERE] Unexpected exception
java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
	at java.util.ArrayList$Itr.next(Unknown Source)
	at net.minecraft.server.World.getTileEntity(World.java:1644)
	at net.minecraft.server.WorldServer.getTileEntity(WorldServer.java:45)
	at eloraam.core.TubeLib.isConSide(TubeLib.java:303)
	at eloraam.core.TubeLib.getConnections(TubeLib.java:365)
	at eloraam.core.TubeFlow$TubeScheduleContext.<init>(TubeFlow.java:23)
	at eloraam.core.TubeFlow.update(TubeFlow.java:52)
	at eloraam.machine.TileTube.q_(TileTube.java:227)
	at net.minecraft.server.World.tickEntities(World.java:1190)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:569)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:467)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Please help. :/

[j0ach1mmall3]

I've got that one too :S

[Kalbintion]

Issues belong on the tracker. Link at top of page.