Servercrash: Exception in server tick loop // Need help sorting this problem out

  • Thread starter Thread starter /u/FootOpening7376
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/u/FootOpening7376

Guest
Our server keeps on crashing and I have no idea what to do. I already discussed this with Claude and ChatGPT and both couldnt really help me. Please help me yall. The server keeps on crashing every 1h now. Before it crashed cuz of chunks, then I removed Ice n Fire & pehkui and it still crashed, gave me: Description: Exception ticking world on the 25th, then 9 crashes happened and we still coudnt figure out whats wrong. For any advice and any help I would be very thankful!

---- Minecraft Crash Report --

// Shall we play a game?

Time: 2026-01-27 16:23:36

Description: Exception in server tick loop

java.util.ConcurrentModificationException: null

at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:1095) \~\[?:?\] {} at java.util.ArrayList$Itr.next(ArrayList.java:1049) \~\[?:?\] {} at com.google.common.collect.Iterators$1.next(Iterators.java:146) \~\[guava-31.1-jre.jar%2374!/:?\] {} at java.util.Iterator.forEachRemaining(Iterator.java:133) \~\[?:?\] {re:mixin} at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1939) \~\[?:?\] {} at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) \~\[?:?\] {} at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) \~\[?:?\] {} at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) \~\[?:?\] {} at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) \~\[?:?\] {} at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) \~\[?:?\] {} at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) \~\[?:?\] {} at net.minecraft.world.level.entity.PersistentEntitySectionManager.m\_157543\_(PersistentEntitySectionManager.java:175) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184) \~\[?:?\] {} at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) \~\[?:?\] {} at java.util.stream.LongPipeline$1$1.accept(LongPipeline.java:177) \~\[?:?\] {} at java.util.PrimitiveIterator$OfLong.forEachRemaining(PrimitiveIterator.java:185) \~\[?:?\] {} at java.util.Spliterators$LongIteratorSpliterator.forEachRemaining(Spliterators.java:2144) \~\[?:?\] {} at java.util.Spliterator$OfLong.forEachRemaining(Spliterator.java:777) \~\[?:?\] {} at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) \~\[?:?\] {} at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) \~\[?:?\] {} at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151) \~\[?:?\] {} at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174) \~\[?:?\] {} at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) \~\[?:?\] {} at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) \~\[?:?\] {} at net.minecraft.world.level.entity.PersistentEntitySectionManager.m\_157527\_(PersistentEntitySectionManager.java:160) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.world.level.entity.PersistentEntitySectionManager.m\_287207\_(PersistentEntitySectionManager.java:146) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.server.level.ChunkMap.m\_287285\_(ChunkMap.java:1307) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:railways.mixins.json:ChunkMapAccessor,pl:mixin:APP:ars\_nouveau.mixins.json:camera.ChunkMapMixin,pl:mixin:APP:railways-common.mixins.json:conductor\_possession.ChunkMapMixin,pl:mixin:A} at net.minecraft.server.level.ChunkHolder.m\_287189\_(ChunkHolder.java:346) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,re:classloading} at net.minecraft.server.level.ChunkHolder.m\_143003\_(ChunkHolder.java:416) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,re:classloading} at net.minecraft.server.level.DistanceManager.m\_183906\_(DistanceManager.java:120) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:classloading,pl:accesstransformer:B} at java.util.concurrent.ConcurrentHashMap$KeySetView.forEach(ConcurrentHashMap.java:4709) \~\[?:?\] {re:mixin} at net.minecraft.server.level.DistanceManager.m\_140805\_(DistanceManager.java:119) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:classloading,pl:accesstransformer:B} at net.minecraft.server.level.ServerChunkCache.m\_8489\_(ServerChunkCache.java:273) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.server.level.ServerChunkCache$MainThreadExecutor.m\_7245\_(ServerChunkCache.java:545) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:classloading,pl:accesstransformer:B} at net.minecraft.server.level.ServerChunkCache.m\_8466\_(ServerChunkCache.java:269) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.server.MinecraftServer.m\_129961\_(MinecraftServer.java:758) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:computing\_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix\_loop\_spin\_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated\_reload\_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:fragmentum.mixins.json:MixinMinecraftServer,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin,pl:mixin:A} at net.minecraft.server.MinecraftServer.m\_7245\_(MinecraftServer.java:747) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:computing\_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix\_loop\_spin\_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated\_reload\_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:fragmentum.mixins.json:MixinMinecraftServer,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin,pl:mixin:A} at net.minecraft.util.thread.BlockableEventLoop.m\_18701\_(BlockableEventLoop.java:139) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:computing\_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at net.minecraft.server.MinecraftServer.mixinextras$bridge$m\_18701\_$247(MinecraftServer.java) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:computing\_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix\_loop\_spin\_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated\_reload\_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:fragmentum.mixins.json:MixinMinecraftServer,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin,pl:mixin:A} at net.minecraft.server.MinecraftServer.wrapOperation$zbg000$managedBlock(MinecraftServer.java:1856) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:computing\_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix\_loop\_spin\_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated\_reload\_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:fragmentum.mixins.json:MixinMinecraftServer,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin,pl:mixin:A} at net.minecraft.server.MinecraftServer.m\_130012\_(MinecraftServer.java:733) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:computing\_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix\_loop\_spin\_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated\_reload\_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:fragmentum.mixins.json:MixinMinecraftServer,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin,pl:mixin:A} at net.minecraft.server.MinecraftServer.m\_130011\_(MinecraftServer.java:665) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:computing\_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix\_loop\_spin\_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated\_reload\_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:fragmentum.mixins.json:MixinMinecraftServer,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin,pl:mixin:A} at net.minecraft.server.MinecraftServer.m\_206580\_(MinecraftServer.java:251) \~\[server-1.20.1-20230612.114412-srg.jar%23367!/:?\] {re:mixin,pl:accesstransformer:B,re:computing\_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:modernfix-common.mixins.json:perf.fix\_loop\_spin\_waiting.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:modernfix-common.mixins.json:perf.dedicated\_reload\_executor.MinecraftServerMixin,pl:mixin:APP:modernfix-forge.mixins.json:core.MinecraftServerMixin,pl:mixin:APP:citadel.mixins.json:MinecraftServerMixin,pl:mixin:APP:balm.mixins.json:MinecraftServerMixin,pl:mixin:APP:fragmentum.mixins.json:MixinMinecraftServer,pl:mixin:APP:blueprint.mixins.json:MinecraftServerMixin,pl:mixin:A} at java.lang.Thread.run(Thread.java:1583) \~\[?:?\] {re:mixin}

Modlist:

adaptive_performance_tweaks_core_1.20.1-11.5.0.jar

YungsBetterDungeons-1.20-Forge-4.0.4.jar

kuma-api-forge-20.1.12+1.20.1.jar

create_misc_and_things_1.20.1_4.0A.jar

netherportalfix-forge-1.20-13.0.1.jar

geckolib-forge-1.20.1-4.8.2.jar

player-animation-lib-forge-1.0.2-rc1+1.20.jar

SlashBladeResharped-1.20.1-1.8.61.jar

YungsBetterOceanMonuments-1.20-Forge-3.0.4.jar

Incendium_1.20.x_v5.3.5.jar

sophisticatedcore-1.20.1-1.2.107.1240.jar

Prism-1.20.1-forge-1.0.5.jar

modernfix-forge-5.25.1+mc1.20.1.jar

citadel-2.6.2-1.20.1.jar

YungsApi-1.20-Forge-4.0.6.jar

cobweb-forge-1.20.1-1.0.1.jar

sophisticatedbackpacks-1.20.1-3.24.12.1411.jar

relics-1.20.1-0.8.0.11.jar

createdieselgenerators-1.20.1-1.3.8.jar

medieval_buildings-1.20.1-1.1.2-forge.jar

balm-forge-1.20.1-7.3.37-all.jar

melody_forge_1.0.3_MC_1.20.1-1.20.4.jar

exposure-1.20.1-1.7.16-forge.jar

cloth-config-11.1.136-forge.jar

konkrete_forge_1.8.0_MC_1.20-1.20.1.jar

Geophilic_v3.4.4_f15-88.mod.jar

FarmersDelight-1.20.1-1.2.9.jar

handcrafted-forge-1.20.1-3.0.6.jar

combatroll-forge-1.3.3+1.20.1.jar

mobcollisionoff-2.0.jar

alekiNiftyShips-FORGE-1.20.1-1.0.14.jar

Chunky-1.3.146.jar

resourcefulconfig-forge-1.20.1-2.1.3.jar

tidal-towns-1.3.4.jar

spark-1.10.53-forge.jar

illagerblabber-1.20.1-Forge-1.0.2.jar

curios-forge-5.14.1+1.20.1.jar

collective-1.20.1-8.13.jar

CerbonsAPI-Forge-1.20.1-1.1.0.jar

dungeons-and-taverns-3.0.3.f.jar

dawnoftimebuilder-forge-1.20.1-1.5.39.jar

Icarus-Forge-2.12.0.jar

resourcefullib-forge-1.20.1-2.1.29.jar

InventoryProfilesNext-forge-1.20-1.10.19.jar

deeperdarker-forge-1.20.1-1.3.3.jar

architectury-9.2.14-forge.jar

tru.e-ending-v1.1.0c.jar

monolib-forge-1.20.1-2.1.0.jar

arsdelight-1.1.6.jar

adaptive_performance_tweaks_items_1.20.1-11.5.0.jar

l2library-2.5.1-slim.jar

goblins_tyranny-1.2.3-forge-1.20.1.jar

Towns-and-Towers-1.12-Fabric+Forge.jar

DynamicTrees-1.20.1-1.4.7.jar

EnchantingInfuser-v8.0.3-1.20.1-Forge.jar

recruits-1.20.1-1.14.2.jar

SmartBrainLib-forge-1.20.1-1.15.jar

Create_Questing-FORGE-1.20.1-1.0.0.jar

bellsandwhistles-0.4.5-1.20.x-Create6.0+.jar

ftb-library-forge-2001.2.9.jar

ftb-teams-forge-2001.3.1.jar

amendments-1.20-2.2.2.jar

OctoLib-FORGE-0.5.0.1+1.20.1.jar

mobs_of_mythology-forge-1.20.1-2.1.2.jar

edf-remastered-4.3.jar

jei-1.20.1-forge-15.20.0.121.jar

common-networking-forge-1.0.5-1.20.1.jar

callablehorses-1.20.1-1.3.0.1.jar

siegeweapons-1.20.1-0.2.1.jar

caelus-forge-3.2.0+1.20.1.jar

obscure_api-18.jar

waystones-forge-1.20.1-14.1.17.jar

fragmentum-forge-1.20.1-0.6.9.jar

NaturesCompass-1.20.1-1.11.2-forge.jar

create_high_pressure-1.1.0.jar

knightlib-forge-1.20.1-1.4.2.jar

Continents_1.21.x_v1.1.11.jar

BOMD-Forge-1.20.1-1.1.2.jar

Terralith_1.20.x_v2.5.4.jar

blueprint-1.20.1-7.1.3.jar

savage_and_ravage-1.20.1-6.0.1.jar

azurelib-neo-1.20.1-3.0.15.jar

memoryleakfix-forge-1.17+-1.1.5.jar

ars_nouveau-1.20.1-4.12.7-all.jar

watut-forge-1.20.1-1.2.3.jar

puzzlesaccessapi-forge-20.1.1.jar

DungeonsAriseSevenSeas-1.19.2-1.0.2-forge.jar

forge-1.20.1-47.4.10-universal.jar

CutThrough-v8.0.2-1.20.1-Forge.jar

tarotcards-1.20-1.7.0.jar

DungeonsArise-1.20.x-2.1.58-release.jar

bossesrise-1.20.1-forge-1.0.9.2b.jar

butcher-3.6.1-forge-1.20.1.jar

realmrpg_skeletons-1.1.0-forge-1.20.1.jar

alexscaves-2.0.2.jar

voicechat-forge-1.20.1-2.6.6.jar

Steam_Rails-1.6.14-beta+forge-mc1.20.1.jar

tablist-1.0.2.jar

simplyswords-forge-1.56.0-1.20.1.jar

moonlight-1.20-2.16.16-forge.jar

Necronomicon-Forge-1.6.0+1.20.1.jar

ftb-quests-forge-2001.4.14.jar

ftb-xmod-compat-forge-2.1.3.jar

createoreexcavation-1.20-1.6.5.jar

knightquest-forge-1.20.1-1.9.3.jar

spectrelib-forge-0.13.17+1.20.1.jar

kffmod-4.11.0.jar

Ribbits-1.20.1-Forge-3.0.4.jar

Iceberg-1.20.1-forge-1.1.25.jar

flywheel-forge-1.20.1-1.0.5.jar

Ponder-Forge-1.20.1-1.0.91.jar

create-1.20.1-6.0.8.jar

sliceanddice-forge-3.6.0.jar

SpartanShields-1.20.1-forge-3.1.1.jar

gravestone-forge-1.20.1-1.0.35.jar

polymorph-forge-0.49.10+1.20.1.jar

StorageDrawers-forge-1.20.1-12.14.3.jar

sit-1.20.1-1.3.5.jar

irons_spellbooks-1.20.1-3.15.0.jar

immersive_paintings-0.6.8+1.20.1-forge.jar

Armor_of_the_Ages-forge-1.20.1-1.3.11.jar

serversleep-datapack.jar

cryonicconfig-forge-1.0.0+mc1.20.1.jar

coroutil-forge-1.20.1-1.3.7.jar

Vampirism-1.20.1-1.10.13.jar

VampiresNeedUmbrellas-1.20.1-1.0.1.jar

lootr-forge-1.20-0.7.35.93.jar

ferritecore-6.0.1-forge.jar

chisel-forge-2.0.0+mc1.20.1.jar

yet_another_config_lib_v3-3.6.6+1.20.1-forge.jar

PuzzlesLib-v8.1.33-1.20.1-Forge.jar

create_enchantment_industry-1.3.3-for-create-6.0.6.jar

healingcampfire-1.20.1-6.2.jar

ultramarine-1.20.1-0.5.1.jar

aquamirae-forge-1.20.1-6.1.2.jar

cristellib-1.1.6-forge.jar

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