The crash occoured when a Create Cores++ overheated while I was fighting a Nightmare from the Infinite Spire mod. Here is the log of the turn leading up to the crash

03:06:13.247 INFO basemod.BaseMod> publishPreMonsterTurn
03:06:14.130 INFO unlock.UnlockTracker> Already seen: Burn
03:06:14.131 INFO basemod.BaseMod> publishPostEnergyRecharge
03:06:14.547 INFO basemod.BaseMod> powers modified
03:06:14.714 INFO basemod.BaseMod> powers modified
03:06:14.914 INFO basemod.BaseMod> powers modified
03:06:15.231 INFO basemod.BaseMod> publish on post power apply
03:06:15.231 INFO basemod.BaseMod> powers modified
03:06:15.526 INFO basemod.BaseMod> publishPostDraw
03:06:15.581 INFO basemod.BaseMod> publishPostDraw
03:06:15.715 INFO basemod.BaseMod> publishPostDraw
03:06:15.847 INFO basemod.BaseMod> publishPostDraw
03:06:16.148 INFO unlock.UnlockTracker> Already seen: Burn
03:06:16.282 INFO basemod.BaseMod> publishPostDraw
03:06:16.331 INFO basemod.BaseMod> publishPostDraw
03:06:16.380 INFO basemod.BaseMod> publishPostDraw
03:06:16.431 INFO basemod.BaseMod> publishPostDraw
03:06:16.481 INFO basemod.BaseMod> publishPostDraw
03:06:16.581 INFO basemod.BaseMod> publishPostDraw
03:06:16.747 INFO basemod.BaseMod> publish on post power apply
03:06:16.748 INFO basemod.BaseMod> powers modified
03:06:16.882 INFO basemod.BaseMod> publishPostDraw
03:06:17.015 INFO basemod.BaseMod> publishPostDraw
03:06:18.697 INFO basemod.BaseMod> publish on card use
03:06:18.697 INFO core.GiantMod> ThMod : Card used : construct:Disrupt
03:06:18.864 INFO basemod.BaseMod> publish on post power apply
03:06:18.865 INFO basemod.BaseMod> powers modified
03:06:18.932 INFO basemod.BaseMod> publish on post power apply
03:06:18.932 INFO basemod.BaseMod> powers modified
03:06:19.081 INFO basemod.BaseMod> publish on post power apply
03:06:19.082 INFO basemod.BaseMod> powers modified
03:06:19.231 INFO basemod.BaseMod> publish on card use
03:06:19.231 INFO core.GiantMod> ThMod : Card used : construct:Boost
03:06:19.298 INFO infinitespire.InfiniteSpire> Lucky Rock
03:06:19.548 INFO basemod.BaseMod> publish on post power apply
03:06:19.549 INFO basemod.BaseMod> powers modified
03:06:20.197 INFO basemod.BaseMod> publish on card use
03:06:20.197 INFO core.GiantMod> ThMod : Card used : construct:CreateCores
03:06:20.200 INFO unlock.UnlockTracker> Already seen: construct:LaserCore
03:06:20.202 INFO unlock.UnlockTracker> Already seen: construct:BatteryCore
03:06:20.202 INFO unlock.UnlockTracker> Already seen: construct:LaserCore
03:06:20.230 DEBUG basemod.BaseMod> Copying card Laser Core with 0 upgrades.
03:06:20.230 DEBUG basemod.BaseMod> Copying card Laser Core with 0 upgrades.
03:06:20.431 DEBUG basemod.BaseMod> Copying card Battery Core with 0 upgrades.
03:06:20.432 DEBUG basemod.BaseMod> Copying card Battery Core with 0 upgrades.
03:06:20.647 DEBUG basemod.BaseMod> Copying card Laser Core with 0 upgrades.
03:06:20.648 DEBUG basemod.BaseMod> Copying card Laser Core with 0 upgrades.
03:06:21.214 INFO basemod.BaseMod> publishPostDraw
03:06:21.348 INFO basemod.BaseMod> publishPostDraw
03:06:21.480 INFO basemod.BaseMod> publishPostDraw
03:06:21.698 INFO basemod.BaseMod> publishPostDraw
03:06:21.831 INFO basemod.BaseMod> publishPostDraw
03:06:21.965 INFO basemod.BaseMod> publishPostDraw
03:06:22.064 INFO basemod.BaseMod> publishPostDraw
03:06:22.282 INFO basemod.BaseMod> publishPostDraw
03:06:22.498 INFO basemod.BaseMod> publishPostDraw
03:06:23.514 INFO basemod.BaseMod> publish on post power apply
03:06:23.515 INFO basemod.BaseMod> powers modified
03:06:24.081 INFO basemod.BaseMod> publish on card use
03:06:24.081 INFO core.GiantMod> ThMod : Card used : construct:SuppressiveFire
03:06:24.198 INFO infinitespire.InfiniteSpire> Lucky Rock
03:06:24.231 INFO basemod.BaseMod> publish on post power apply
03:06:24.231 INFO basemod.BaseMod> powers modified
03:06:24.380 INFO basemod.BaseMod> publish on post power apply
03:06:24.381 INFO basemod.BaseMod> powers modified
03:06:26.197 INFO basemod.BaseMod> publish on card use
03:06:26.197 INFO core.GiantMod> ThMod : Card used : construct:ShieldBurst
03:06:26.647 INFO infinitespire.InfiniteSpire> Lucky Rock
03:06:27.898 INFO basemod.BaseMod> publishPostDraw
03:06:27.947 INFO basemod.BaseMod> publishPostDraw
03:06:27.997 INFO basemod.BaseMod> publishPostDraw
03:06:28.097 INFO basemod.BaseMod> publishPostDraw
03:06:28.231 INFO basemod.BaseMod> publishPostDraw
03:06:28.450 ERROR core.CardCrawlGame> Exception caught
java.lang.NullPointerException: null
at constructmod.actions.OverheatAction.lambda$update$0(OverheatAction.java:54) ~[ConstructMod.jar:?]
at java.util.ArrayList.removeIf(ArrayList.java:1405) ~[?:1.8.0_144]
at constructmod.actions.OverheatAction.update(OverheatAction.java:54) ~[ConstructMod.jar:?]
at com.megacrit.cardcrawl.actions.GameActionManager.update(GameActionManager.java:155) ~[?:?]
at com.megacrit.cardcrawl.rooms.AbstractRoom.update(AbstractRoom.java:283) ~[?:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.update(AbstractDungeon.java:2551) ~[?:?]
at com.megacrit.cardcrawl.core.CardCrawlGame.update(CardCrawlGame.java:877) ~[?:?]
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:429) [?:?]
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225) [?:?]
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126) [desktop-1.0.jar:?]