ConcurrentModificationException

[13:58:11 ERROR]: [MythicMobs] [SCHEDULER] Exception thrown whilst executing task
[13:58:11 WARN]: java.util.ConcurrentModificationException
[13:58:11 WARN]: at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966)
[13:58:11 WARN]: at java.util.LinkedList$ListItr.next(LinkedList.java:888)
[13:58:11 WARN]: at io.lumine.xikage.mythicmobs.mobs.MythicMob.lambda$executeSkills$3(MythicMob.java:1057)
[13:58:11 WARN]: at io.lumine.xikage.mythicmobs.utils.Delegates$RunnableToSupplier.get(Delegates.java:121)
[13:58:11 WARN]: at io.lumine.xikage.mythicmobs.utils.promise.LuminePromise$SupplyRunnable.run(LuminePromise.java:654)
[13:58:11 WARN]: at io.lumine.xikage.mythicmobs.utils.tasks.LumineExecutors$SchedulerWrappedRunnable.run(LumineExecutors.java:70)
[13:58:11 WARN]: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[13:58:11 WARN]: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

Seems to be random with different skills. Using build 3466 4.11.0-SNAPSHOT