UltraCosmeticsError

[21:08:46] [Craft Scheduler Thread - 2368/WARN]: Exception in thread "Craft Scheduler Thread - 2368"
[21:08:46] [Craft Scheduler Thread - 2368/WARN]: org.apache.commons.lang.UnhandledException: Plugin UltraCosmetics vRelease 1.1.3 generated an exception while executing task 222034268
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at org.bukkit.craftbukkit.v1_8_R3.CraftWorld.getEntities(CraftWorld.java:626)
	at be.isach.ultracosmetics.cosmetics.gadgets.GadgetDiscoBall.getNearbyEntities(GadgetDiscoBall.java:139)
	at be.isach.ultracosmetics.cosmetics.gadgets.GadgetDiscoBall.onUpdate(GadgetDiscoBall.java:124)
	at be.isach.ultracosmetics.cosmetics.gadgets.Gadget$1.run(Gadget.java:87)
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71)
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
	... 3 more