02:55:40 [SEVERE] java.util.ConcurrentModificationException
02:55:40 [SEVERE]       at java.util.ArrayList.writeObject(ArrayList.java:713)
02:55:40 [SEVERE]       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
02:55:40 [SEVERE]       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
02:55:40 [SEVERE]       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
02:55:40 [SEVERE]       at java.lang.reflect.Method.invoke(Method.java:601)
02:55:40 [SEVERE]       at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:975)
02:55:40 [SEVERE]       at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480)
02:55:40 [SEVERE]       at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416)
02:55:40 [SEVERE]       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174)
02:55:40 [SEVERE]       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346)
02:55:40 [SEVERE]       at pl.islandworld.SLAPI.save(SLAPI.java:17)
02:55:40 [SEVERE]       at pl.islandworld.IslandWorld.saveDatFiles(IslandWorld.java:747)
02:55:40 [SEVERE]       at pl.islandworld.IslandWorld$Regenerate.run(IslandWorld.java:923)
02:55:40 [SEVERE]       at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftTask.run(CraftTask.java:58)
02:55:40 [SEVERE]       at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
02:55:40 [SEVERE]       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
02:55:40 [SEVERE]       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
02:55:40 [SEVERE]       at java.lang.Thread.run(Thread.java:722)