I've been dealing with constant crashes when starting a room at seemingly complete random that have this message.
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.monsters.MonsterGroup.usePreBattleAction(MonsterGroup.java:95) ~[?:?]
at com.megacrit.cardcrawl.characters.AbstractPlayer.preBattlePrep(AbstractPlayer.java:2009) ~[?:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.nextRoomTransition(AbstractDungeon.java:2295) ~[?:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.nextRoomTransition(AbstractDungeon.java:2119) ~[?:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.updateFading(AbstractDungeon.java:2848) ~[?:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.update(AbstractDungeon.java:2517) ~[?:?]
at com.megacrit.cardcrawl.core.CardCrawlGame.update(CardCrawlGame.java:876) ~[?:?]
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:423) [?:?]
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225) [?:?]
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126) [?:?]

I have been removing mods and keeping notes for each crash, and the crashes I suspect are coming from one of these mods:
libraryofruina
leshy
reimu
blade gunner
crimsoneyed

I'll update once I've determined which one.

Update:
I have confirmed that library of ruina mod by call of fleet causes the game to crash at the start of rooms randomly.
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.monsters.MonsterGroup.usePreBattleAction(MonsterGroup.java:95)
at com.megacrit.cardcrawl.characters.AbstractPlayer.preBattlePrep(AbstractPlayer.java:2009)
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.nextRoomTransition(AbstractDungeon.java:2295)
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.nextRoomTransition(AbstractDungeon.java:2119)
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.updateFading(AbstractDungeon.java:2848)
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.update(AbstractDungeon.java:2517)
at com.megacrit.cardcrawl.core.CardCrawlGame.update(CardCrawlGame.java:876)
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:423)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126)

It is also the cause for the unreasonable buff timing that crashed earlier.

Thank you for your feedback. I will contact the author of this mod to find a way to identify the cause of the bug. In the meantime, please avoid enabling this mod together with Library Of Ruina. I will include this conflict in the mod description.

It looks like the newest update has some incompatability with spire biomes. I recieved this error while trying to exit in the storm biome. I will try and see if I can disable the shader for the biome.

Game crashed.
Version Info:
- Java version (1.8.0_144)
- Slay the Spire (12-18-2022)
- ModTheSpire (3.30.3)
Mod list:
- basemod (5.54.1)
- actlikeit (1.2.8)
- stslib (2.11.0)
- Abyss (1.3.0)
- coloredmap (2.4.1)
- coloredpowertips (2.3.0)
- CorruptTheSpire (1.4.3)
- Elementarium (1.10.0)
- Gensokyo (4.0.0)
- Hallownest (1.0.2)
- Menagerie (1.6.2)
- ruina (3.7.0)
- mintyspire (2.5.7)
- oceanmod (1.0.18)
- OptimizeTheSpire (1.1.0)
- ramsaver (0.2.3)
- versiontwocompatible (2.2.6)
- timemazedefuse (1.0)
- discardoretaino (1.0.0)
- downfall (5.1.2)
- Palworld (0.1)
- anniv6 (1.4.3)
- VUPShionMod (8.3.4)

Mods in stacktrace:
- Palworld (0.1)
- anniv6 (1.4.3)
Cause:
java.lang.NullPointerException
at patches.action.ChangeTargetPatch$ChangeDamageTarget$ChangeBuff2Target.Postfix(ChangeTargetPatch.java:419)
at com.megacrit.cardcrawl.actions.AbstractGameAction.setValues(AbstractGameAction.java:47)
at com.megacrit.cardcrawl.actions.animations.VFXAction.<init>(VFXAction.java:22)
at com.megacrit.cardcrawl.actions.animations.VFXAction.<init>(VFXAction.java:14)
at spireMapOverhaul.zones.storm.patches.AddLightningPatch$GreaseLightning.ICanNameMyPatchClassesWhateverIWantGKLOL(AddLightningPatch.java:37)
at com.megacrit.cardcrawl.rooms.AbstractRoom.update(AbstractRoom.java)
at com.megacrit.cardcrawl.rooms.RestRoom.update(RestRoom.java:45)
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.update(AbstractDungeon.java:2532)
at com.megacrit.cardcrawl.core.CardCrawlGame.update(CardCrawlGame.java:876)
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:423)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126)

Mod list:
- basemod (5.54.1)
- stslib (2.11.0)
- ColorfulMod (1.3.4)
- CorruptTheSpire (1.4.3)
- actlikeit (1.2.8)
- LazyManKits (1.4.11)
- conspire (1.7.0)
- quickrestart (2.1.0)
- challengethespire (1.6.0)
- betterrewardsmod (4.5.2)
- EasyBlight (0.1)
- Gensokyo (4.0.0)
- AKDsMoreRelics (1.5.1)
- ShopMod (1.1.2)
- spicyShops (1.2.4)
- atmod (1.1.9)
- YoimiyaMod (1.1.3)
- Yami (0.1)
- Konpaku_Youmu (0.0.9)
- Akemi_Homura (1.11.10)
- ReplayTheSpireMod (1.6.7)
- Goldenglow (1.0.0)
- KaltsitMod (0.4.0)
- TS05_Marisa (0.15.4)
- Remilia_Modoki (0.0.9)
- IrisRaphael (1.2.0)
- Traveler (1.2.3)
- REMEMod (0.13.3)
- HearthSpire (0.0.3)
- shadowverse (3.5.8)
- VUPShionMod (8.3.4)
- loadout (1.0.6)
- bossedrelics (2.6.0)
- BossyRelics (0.9.2)
- BlueArchive_Aris (1.0.9)
- BlueArchive_Hifumi (1.0.11)
- nearlmod (1.2.1)
- Koakuma (0.0.9)
- Livetwins (0.0.1)
- MagicGirl (0.0.4)
- Shion (0.1)
- SilverBullet (1.2.4)
- Sky_Striker_Ace (1.1.1)
- Typhon_FimmlpS (0.9.3)
- VertinMod (0.0.3)
- RikaSatoko (1.5.6)
- BlueArchive_SaibaSisters_Mod (1.0)
- Skadi_mod (0.0.2)
- AyaMod (0.2.8)
- MyElainaMod (1.0.1)
- HifuuMod (1.6.0)
- ApiMod (1.0.6)
- strops (0.10.5)
- Palworld (0.1.5)
- 犹格索托斯的庭院 (1.0.0)
- ShionUnlock (1.0.0)
- UnlockAllMod (1.2)
- Astesiamod (0.1.8)


08:02:33.951 INFO util.TextureLoader> DefaultMod | Loading Texture: BlueArchive_HifumiResources/images/char/other/Perorodzilla.png
08:02:33.964 INFO util.TextureLoader> DefaultMod | Loading Texture: BlueArchive_HifumiResources/images/powers/PerorodzillaPower84.png
08:02:33.974 INFO util.TextureLoader> DefaultMod | Loading Texture: BlueArchive_HifumiResources/images/powers/PerorodzillaPower32.png
08:02:33.975 INFO util.TextureLoader> DefaultMod | Loading Texture: BlueArchive_HifumiResources/images/char/other/Peroro.png
08:02:33.977 INFO util.TextureLoader> DefaultMod | Loading Texture: BlueArchive_HifumiResources/images/char/other/Hologram.png
08:02:33.978 INFO util.TextureLoader> DefaultMod | Loading Texture: BlueArchive_HifumiResources/images/powers/PeroroHologramPower84.png
08:02:33.978 INFO util.TextureLoader> DefaultMod | Loading Texture: BlueArchive_HifumiResources/images/powers/PeroroHologramPower32.png
08:02:33.991 INFO util.TextureLoader> GensokyoMod | Loading Texture: GensokyoResources/images/powers/Moon84.png
08:02:33.998 INFO util.TextureLoader> GensokyoMod | Loading Texture: GensokyoResources/images/powers/Moon32.png
08:02:34.002 INFO util.TextureLoader> GensokyoMod | Loading Texture: GensokyoResources/images/powers/Polymorph84.png
08:02:34.004 INFO util.TextureLoader> GensokyoMod | Loading Texture: GensokyoResources/images/powers/Polymorph32.png
08:02:34.603 INFO core.CardCrawlGame> PAUSE()

mod list 同上 log里错误报告如下
08:51:37.850 ERROR core.CardCrawlGame> Exception caught
com.badlogic.gdx.utils.GdxRuntimeException: Error loading pixmap.
at com.badlogic.gdx.graphics.g2d.Gdx2DPixmap.<init>(Gdx2DPixmap.java:128) ~[desktop-1.0.jar:?]
at com.badlogic.gdx.graphics.Pixmap.<init>(Pixmap.java:122) ~[desktop-1.0.jar:?]
at com.badlogic.gdx.graphics.g2d.PixmapPacker$Page.<init>(PixmapPacker.java:352) ~[desktop-1.0.jar:?]
at com.badlogic.gdx.graphics.g2d.PixmapPacker$GuillotineStrategy$GuillotinePage.<init>(PixmapPacker.java:500) ~[desktop-1.0.jar:?]
at com.badlogic.gdx.graphics.g2d.PixmapPacker$GuillotineStrategy.pack(PixmapPacker.java:426) ~[desktop-1.0.jar:?]
at com.badlogic.gdx.graphics.g2d.PixmapPacker.pack(PixmapPacker.java:158) ~[desktop-1.0.jar:?]
at com.brashmonkey.spriter.LibGdx.LibGdxLoader.finishLoading(LibGdxLoader.java:109) ~[BaseMod.jar:?]
at com.brashmonkey.spriter.Loader.load(Loader.java:78) ~[BaseMod.jar:?]
at com.brashmonkey.spriter.Loader.load(Loader.java:86) ~[BaseMod.jar:?]
at Gensokyo.BetterSpriterAnimation.<init>(BetterSpriterAnimation.java:40) ~[Gensokyo.jar:?]
at Gensokyo.monsters.act1.Aya.<init>(Aya.java:68) ~[Gensokyo.jar:?]
at Gensokyo.monsters.act1.Aya.<init>(Aya.java:63) ~[Gensokyo.jar:?]
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_144]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_144]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_144]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_144]
at java.lang.Class.newInstance(Class.java:442) ~[?:1.8.0_144]
at utils.InstanceMaker.getInstanceByClass(InstanceMaker.java:26) ~[Palmod-0.1.jar:?]
at utils.InstanceMaker.getInstanceByClass(InstanceMaker.java:16) ~[Palmod-0.1.jar:?]
at relics.PokeGo.onEnterRoom(PokeGo.java:119) ~[Palmod-0.1.jar:?]
at relics.lineTwo.InfoBlight.onEnterRoom(InfoBlight.java:150) ~[Palmod-0.1.jar:?]
at relics.lineTwo.relicToBlight.blightHook.BlightOnEnterRoom$OnEnterRoomPatch.OnEnterRoomInsert(BlightOnEnterRoom.java:39) ~[Palmod-0.1.jar:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.nextRoomTransition(AbstractDungeon.java:2215) ~[?:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.nextRoomTransition(AbstractDungeon.java:2119) ~[?:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.updateFading(AbstractDungeon.java:2848) ~[?:?]
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.update(AbstractDungeon.java:2517) ~[?:?]
at com.megacrit.cardcrawl.core.CardCrawlGame.update(CardCrawlGame.java:876) ~[?:?]
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:423) [?:?]
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225) [?:?]
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126) [?:?]
08:51:37.878 INFO core.CardCrawlGame> PAUSE()
08:51:37.882 INFO core.CardCrawlGame> Game shutting down...
08:51:37.882 INFO core.CardCrawlGame> Flushing saves to disk...
08:51:37.882 INFO core.CardCrawlGame> Shutting down controller handler...
08:51:37.882 INFO helpers.FileSaver> Save thread interrupted!
08:51:37.883 INFO helpers.FileSaver> Save thread will die now.
08:51:37.886 INFO core.CardCrawlGame> Shutting down publisher integrations...
08:51:37.927 INFO core.CardCrawlGame> Flushing logs to disk. Clean shutdown successful.

额，你试试把我这个mod关了试试，我看报错似乎是因为内存不够导致的

Cause:
java.lang.NullPointerException
at com.badlogic.gdx.graphics.g2d.BitmapFontCache.addText(BitmapFontCache.java:480)
at com.badlogic.gdx.graphics.g2d.BitmapFont.draw(BitmapFont.java:201)
at com.megacrit.cardcrawl.helpers.FontHelper.renderFontCenteredTopAligned(FontHelper.java:1402)
at com.megacrit.cardcrawl.ui.campfire.AbstractCampfireOption.render(AbstractCampfireOption.java:147)
at com.megacrit.cardcrawl.rooms.CampfireUI.renderCampfireButtons(CampfireUI.java:482)
at com.megacrit.cardcrawl.rooms.CampfireUI.render(CampfireUI.java:394)
at com.megacrit.cardcrawl.rooms.RestRoom.render(RestRoom.java:72)
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.render(AbstractDungeon.java:2678)
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:441)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126)

Cause:
java.lang.NullPointerException
at com.badlogic.gdx.graphics.g2d.BitmapFontCache.addText(BitmapFontCache.java:480)
at com.badlogic.gdx.graphics.g2d.BitmapFont.draw(BitmapFont.java:201)
at com.megacrit.cardcrawl.helpers.FontHelper.renderFontCenteredTopAligned(FontHelper.java:1402)
at com.megacrit.cardcrawl.ui.campfire.AbstractCampfireOption.render(AbstractCampfireOption.java:147)
at com.megacrit.cardcrawl.rooms.CampfireUI.renderCampfireButtons(CampfireUI.java:482)
at com.megacrit.cardcrawl.rooms.CampfireUI.render(CampfireUI.java:394)
at com.megacrit.cardcrawl.rooms.RestRoom.render(RestRoom.java:72)
at com.megacrit.cardcrawl.dungeons.AbstractDungeon.render(AbstractDungeon.java:2678)
at com.megacrit.cardcrawl.core.CardCrawlGame.render(CardCrawlGame.java:441)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:225)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:126)

感谢反馈，进火堆崩溃的bug最新版本已修复