[21:30:16] [Server thread/FATAL] [minecraft/ThreadTaskExecutor]: Error executing task on Server
java.util.ConcurrentModificationException: null
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1445) ~[?:1.8.0_275] {}
	at java.util.HashMap$ValueIterator.next(HashMap.java:1474) ~[?:1.8.0_275] {}
	at de.teamlapen.vampirism.player.hunter.actions.PotionResistanceHunterAction.onUpdate(PotionResistanceHunterAction.java:56) ~[?:?] {re:classloading}
	at de.teamlapen.vampirism.player.hunter.actions.PotionResistanceHunterAction.activate(PotionResistanceHunterAction.java:67) ~[?:?] {re:classloading}
	at de.teamlapen.vampirism.player.hunter.actions.PotionResistanceHunterAction.activate(PotionResistanceHunterAction.java:16) ~[?:?] {re:classloading}
	at de.teamlapen.vampirism.api.entity.player.actions.DefaultAction.onActivated(DefaultAction.java:54) ~[?:?] {re:classloading}
	at de.teamlapen.vampirism.player.actions.ActionHandler.toggleAction(ActionHandler.java:268) ~[?:?] {re:classloading}
	at de.teamlapen.vampirism.network.InputEventPacket.lambda$null$2(InputEventPacket.java:113) ~[?:?] {re:classloading}
	at java.util.Optional.ifPresent(Optional.java:159) ~[?:1.8.0_275] {}
	at de.teamlapen.vampirism.network.InputEventPacket.lambda$handle$12(InputEventPacket.java:109) ~[?:?] {re:classloading}
	at net.minecraftforge.fml.network.NetworkEvent$Context.enqueueWork(NetworkEvent.java:215) ~[forge:?] {re:classloading}
	at de.teamlapen.vampirism.network.InputEventPacket.handle(InputEventPacket.java:89) ~[?:?] {re:classloading}