Marisa run, crash at end of combat vs Nightmare elite from Infinite Spire

17:04:20.767 INFO infinitespire.InfiniteSpire> Nightmare
17:04:21.465 INFO ThMod.ThMod> SuperNovaPower : discardCheck : Burn detected.
I was checked!
I was checked!
17:04:21.816 INFO characters.AbstractPlayer> Reorganizing relics
17:04:21.816 INFO basemod.BaseMod> publish on relic get
17:04:21.818 INFO basemod.BaseMod> publish on relic get
17:04:21.818 INFO basemod.BaseMod> publish on relic get
17:04:21.818 INFO basemod.BaseMod> publish on relic get
17:04:21.818 INFO basemod.BaseMod> publish on relic get
17:04:21.819 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.820 INFO basemod.BaseMod> publish on relic get
17:04:21.821 INFO basemod.BaseMod> publish on relic get
17:04:21.823 INFO basemod.BaseMod> publish on relic get
17:04:21.825 INFO basemod.BaseMod> publish on relic get
17:04:21.825 INFO basemod.BaseMod> publish on relic get
17:04:21.825 INFO basemod.BaseMod> publish on relic get
17:04:21.825 INFO basemod.BaseMod> publish on relic get
17:04:21.825 INFO basemod.BaseMod> publish on relic get
17:04:21.828 INFO basemod.BaseMod> publish on relic get
17:04:21.828 INFO basemod.BaseMod> publish on relic get
17:04:21.828 INFO core.CardCrawlGame> Exception occurred in CardCrawlGame render method!
17:04:21.829 ERROR core.CardCrawlGame> Exception caught
java.util.ConcurrentModificationException: null
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901) ~[?:1.8.0_144]
at java.util.ArrayList$Itr.next(ArrayList.java:851) ~[?:1.8.0_144]
at com.megacrit.cardcrawl.characters.AbstractPlayer.onVictory(AbstractPlayer.java:2539) ~[?:?]
at com.megacrit.cardcrawl.rooms.AbstractRoom.endBattle(AbstractRoom.java:549) ~[?:?]
at com.megacrit.cardcrawl.monsters.AbstractMonster.updateDeathAnimation(AbstractMonster.java:1165) ~[?:?]
at com.megacrit.cardcrawl.monsters.AbstractMonster.update(AbstractMonster.java:225) ~[?:?]
at infinitespire.monsters.Nightmare.update(Nightmare.java:158) ~[InfiniteSpire.jar:?]
at com.megacrit.cardcrawl.monsters.MonsterGroup.update(MonsterGroup.java:337) ~[?:?]
at com.megacrit.cardcrawl.rooms.AbstractRoom.update(AbstractRoom.java:278) ~[?:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.update(AbstractDungeon.java:2532) ~[?:?]
at com.megacrit.cardcrawl.core.CardCrawlGame.update(CardCrawlGame.java:871) ~[?:?]
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:419) [?:?]
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225) [?:?]
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126) [?:?]
Controllers: removed manager for application, 0 managers active
17:04:21.900 INFO core.CardCrawlGame> PAUSE()
17:04:21.901 INFO core.CardCrawlGame> Game shutting down...
17:04:21.906 INFO core.CardCrawlGame> Flushing saves to disk...
17:04:21.906 INFO helpers.FileSaver> Save thread interrupted!
17:04:21.908 INFO core.CardCrawlGame> Shutting down publisher integrations...
17:04:21.908 INFO helpers.FileSaver> Save thread will die now.
17:04:21.931 INFO steam.SteamTicker> [ERROR] SteamAPI stopped running.
17:04:21.954 INFO core.CardCrawlGame> Flushing logs to disk. Clean shutdown successful.
Game crashed.
Cause:java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.next(ArrayList.java:851)
at com.megacrit.cardcrawl.characters.AbstractPlayer.onVictory(AbstractPlayer.java:2539)
at com.megacrit.cardcrawl.rooms.AbstractRoom.endBattle(AbstractRoom.java:549)
at com.megacrit.cardcrawl.monsters.AbstractMonster.updateDeathAnimation(AbstractMonster.java:1165)
at com.megacrit.cardcrawl.monsters.AbstractMonster.update(AbstractMonster.java:225)
at infinitespire.monsters.Nightmare.update(Nightmare.java:158)
at com.megacrit.cardcrawl.monsters.MonsterGroup.update(MonsterGroup.java:337)
at com.megacrit.cardcrawl.rooms.AbstractRoom.update(AbstractRoom.java:278)
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.update(AbstractDungeon.java:2532)
at com.megacrit.cardcrawl.core.CardCrawlGame.update(CardCrawlGame.java:871)
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:419)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126)