I'm getting a crash on my server, it started right after I duplicated my atlas to share with other players. Often it happens when someone logs off who has an atlas. The whole server goes down, and it seems only to happen if there's more than one player online. I don't get the crash just on my own.

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 2022-12-30 08:03:20
Description: Exception in server tick loop

java.util.ConcurrentModificationException
at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1597)
at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1620)
at pepjebs.mapatlases.lifecycle.MapAtlasesServerLifecycleEvents.mapAtlasServerTick(MapAtlasesServerLifecycleEvents.java:151)
at net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.lambda$static$0(ServerTickEvents.java:40)
at net.minecraft.server.MinecraftServer.handler$bcb000$onStartTick(MinecraftServer.java:3816)
at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:819)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:665)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:257)
at java.base/java.lang.Thread.run(Thread.java:833)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- System Details --
Details:
Minecraft Version: 1.19.2
Minecraft Version ID: 1.19.2
Operating System: Linux (amd64) version 3.10.0-1160.11.1.el7.x86_64
Java Version: 17.0.1, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode, sharing), Oracle Corporation
Memory: 1796399216 bytes (1713 MiB) / 3145728000 bytes (3000 MiB) up to 6442450944 bytes (6144 MiB)
CPUs: 8
Processor Vendor: GenuineIntel
Processor Name: Intel(R) Xeon(R) E-2288G CPU @ 3.70GHz
Identifier: Intel64 Family 6 Model 158 Stepping 13
Microarchitecture: Coffee Lake
Frequency (GHz): 3.70
Number of physical packages: 1
Number of physical CPUs: 8
Number of logical CPUs: 16
Graphics card #0 name: unknown
Graphics card #0 vendor: unknown
Graphics card #0 VRAM (MB): 0.00
Graphics card #0 deviceId: unknown
Graphics card #0 versionInfo: unknown
Virtual memory max (MB): 68432.50
Virtual memory used (MB): 110035.56
Swap memory total (MB): 4096.00
Swap memory used (MB): 74.00
JVM Flags: 20 total; -Xms256M -Xmx6144M -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1
Fabric Mods:
adventurez: AdventureZ 1.4.17
another_furniture: Another Furniture 2.1.2-1.19.2
apollo: Apollo's Additional Structures 1.3.1
architectury: Architectury 6.4.62
attributefix: AttributeFix 17.1.2
axesareweapons: Axes Are Weapons 1.6.0
bettercombat: Better Combat 1.5.3+1.19
betterdungeons: YUNG's Better Dungeons 1.19.2-Fabric-3.2.1
betterenchantmentboosting: Better Enchantment Boosting 1.2.1
betteroceanmonuments: YUNG's Better Ocean Monuments 1.19.2-Fabric-2.1.0
betterstrongholds: YUNG's Better Strongholds 1.19.2-Fabric-3.2.0
bettertridents: Better Tridents 4.0.1
bosses_of_mass_destruction: Bosses of Mass Destruction (Beta) 1.4.6-1.19.2
maelstrom_library: Maelstrom Library 1.3-1.19-pre1
multipart_entities: MultipartEntities 1.2-1.19-pre1
bottleyourxp-fabric: Bottle Your Xp (Fabric) 2.2
boundweapons: Boundweapons 1.0.2-1.19.2
bushierflowers: Bushier Flowers 0.0.1-1.19.2
cardinal-components: Cardinal Components API 5.0.2
cardinal-components-block: Cardinal Components API (blocks) 5.0.2
cardinal-components-chunk: Cardinal Components API (chunks) 5.0.2
cardinal-components-item: Cardinal Components API (items) 5.0.2
cardinal-components-level: Cardinal Components API (world saves) 5.0.2
cardinal-components-scoreboard: Cardinal Components API (scoreboard) 5.0.2
cardinal-components-world: Cardinal Components API (worlds) 5.0.2
chimes: Chimes 1.1.4
cloth-api: Cloth API 4.0.65
cloth-client-events-v0: Cloth Client Events v0 4.0.65
cloth-common-events-v1: Cloth Common Events v1 4.0.65
cloth-utils-v1: Cloth Utils v1 4.0.65
cloth-config: Cloth Config v8 8.2.88
cloth-basic-math: cloth-basic-math 0.6.1
clumps: Clumps 9.0.0+14
collective-fabric: Collective (Fabric) 5.22
fiber: fiber 0.23.0-2
combit: ComBit 1.1.4
comforts: Comforts 6.0.3+1.19.2
spectrelib: SpectreLib 0.10.0+1.19
companion: Companion 3.1.2
continents: Continents 1.1
convenientnametags: Convenient Name Tags 0.2.0
copper_golem: Copper Golem 1.4.0
craftablechainmail: Craftable Chainmail Armor 1.19.2-1.6.3-[FABRIC]
craftycuisine: Crafty Cuisine 1.2.0
cursery: Cursery Mod 1.19.2-3.1
dataattributes: Data Attributes 1.2.8
despawningeggshatch-fabric: Despawning Eggs Hatch (Fabric) 2.9
dragonfight: Dragonfight Mod 1.19.2-2.6
dtdash: Double-Tap Dash 1.2.1-1.19
dummmmmmy: MmmMmmMmmMmm 1.19-1.5.3
dungeon_difficulty: Dungeon Difficulty 1.2.1+1.19
com_github_zsoltmolnarrr_tinyconfig: TinyConfig 2.1.1
ecologics: Ecologics 2.1.11
eldritch_mobs: EldritchMobs 1.12.10
polymer: Polymer (Core) 0.2.18+1.19.2
polymer-registry-sync-manipulator: Polymer Registry Sync Manipulator 0.0.3+1.19.2
polymer-blocks-ext: Polymer Blocks 0.1.0-alpha.9+1.19.2
server_translations_api: Server Translations API 1.4.18+1.19.2
packet_tweaker: Packet Tweaker 0.3.0+1.18.2
elytraslot: Elytra Slot 6.0.0+1.19.2
emi: EMI 0.5.3+1.19.2
entitycollisionfpsfix: Entity Collision FPS Fix 2.0.0.0
exlinecopperequipment: Copper Equipment 2.1.2
explorify-fabric: Explorify 1.19-1.3.0
extended_armor_bars: Extended Armor Bars 1.2.1
extraalchemy: Extra Alchemy 1.9.0
fabric-api: Fabric API 0.69.0+1.19.2
fabric-api-base: Fabric API Base 0.4.13+0d0f210290
fabric-api-lookup-api-v1: Fabric API Lookup API (v1) 1.6.12+93d8cb8290
fabric-biome-api-v1: Fabric Biome API (v1) 9.0.20+0d0f210290
fabric-block-api-v1: Fabric Block API (v1) 1.0.1+12bfe4ea90
fabric-command-api-v1: Fabric Command API (v1) 1.2.13+f71b366f90
fabric-command-api-v2: Fabric Command API (v2) 2.1.9+93d8cb8290
fabric-commands-v0: Fabric Commands (v0) 0.2.30+df3654b390
fabric-containers-v0: Fabric Containers (v0) 0.1.38+df3654b390
fabric-content-registries-v0: Fabric Content Registries (v0) 3.4.4+6064db2a90
fabric-convention-tags-v1: Fabric Convention Tags 1.2.0+27265b3490
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.2.7+aeb40ebe90
fabric-data-generation-api-v1: Fabric Data Generation API (v1) 5.3.3+ad31814d90
fabric-dimensions-v1: Fabric Dimensions API (v1) 2.1.33+0d0f210290
fabric-entity-events-v1: Fabric Entity Events (v1) 1.5.2+9244241690
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.4.31+6eb9a2a190
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.31+df3654b390
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.23+c6af733c90
fabric-item-api-v1: Fabric Item API (v1) 1.6.1+fa140d5990
fabric-item-groups-v0: Fabric Item Groups (v0) 0.3.36+9244241690
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 2.2.2+9244241690
fabric-loot-api-v2: Fabric Loot API (v2) 1.1.10+83a8659290
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.1.13+9e7660c690
fabric-message-api-v1: Fabric Message API (v1) 5.0.5+93d8cb8290
fabric-mining-level-api-v1: Fabric Mining Level API (v1) 2.1.21+33fbc73890
fabric-networking-api-v1: Fabric Networking API (v1) 1.2.8+3b1d070f90
fabric-networking-v0: Fabric Networking (v0) 0.3.25+df3654b390
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 4.1.3+06e0e25190
fabric-particles-v1: Fabric Particles (v1) 1.0.12+79adfe0a90
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.9.29+9244241690
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.3.17+0d0f210290
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 3.0.9+c6af733c90
fabric-resource-conditions-api-v1: Fabric Resource Conditions API (v1) 2.1.1+aae9039d90
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.8.2+574a764890
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.3.4+1cc24b1b90
fabric-transfer-api-v1: Fabric Transfer API (v1) 2.1.3+9d081d6490
fabric-transitive-access-wideners-v1: Fabric Transitive Access Wideners (v1) 1.3.2+42d99c3290
fabric-language-kotlin: Fabric Language Kotlin 1.8.7+kotlin.1.7.22
org_jetbrains_kotlin_kotlin-reflect: kotlin-reflect 1.7.22
org_jetbrains_kotlin_kotlin-stdlib: kotlin-stdlib 1.7.22
org_jetbrains_kotlin_kotlin-stdlib-jdk7: kotlin-stdlib-jdk7 1.7.22
org_jetbrains_kotlin_kotlin-stdlib-jdk8: kotlin-stdlib-jdk8 1.7.22
org_jetbrains_kotlinx_atomicfu-jvm: atomicfu-jvm 0.18.5
org_jetbrains_kotlinx_kotlinx-coroutines-core-jvm: kotlinx-coroutines-core-jvm 1.6.4
org_jetbrains_kotlinx_kotlinx-coroutines-jdk8: kotlinx-coroutines-jdk8 1.6.4
org_jetbrains_kotlinx_kotlinx-datetime-jvm: kotlinx-datetime-jvm 0.4.0
org_jetbrains_kotlinx_kotlinx-serialization-cbor-jvm: kotlinx-serialization-cbor-jvm 1.4.1
org_jetbrains_kotlinx_kotlinx-serialization-core-jvm: kotlinx-serialization-core-jvm 1.4.1
org_jetbrains_kotlinx_kotlinx-serialization-json-jvm: kotlinx-serialization-json-jvm 1.4.1
fabricenchantments: Fabric Enchantments 0.9.0
fabricloader: Fabric Loader 0.14.12
forgeconfigapiport: Forge Config API Port 4.2.9
com_electronwill_night-config_core: core 3.6.5
com_electronwill_night-config_toml: toml 3.6.5
frostiful: Frostiful 0.2.6
mm: Manningham Mills 2.3
frycmobvariants: Mob Variants 1.0.2+1.19.2
frycparry: Sword Parry 1.0.4+1.19.2-3
geckolib3: Geckolib 3.1.38
com_eliotlash_mclib_mclib: mclib 20
guardvillagers: Guard Villagers Fabric 1.19.2-1.0.16
herdspanic: Herds Panic 1.0.6
hopobettermineshaft: Hopo Better Mineshaft 1.1.5
incendium: Incendium 5.1.4
java: Java HotSpot(TM) 64-Bit Server VM 17
libjf: LibJF 3.2.1
libjf-base: LibJF Base 3.2.1
libjf-config-commands-v1: LibJF Config Commands 3.2.1
libjf-config-core-v1: LibJF Config 3.2.1
libjf-config-legacy-shim: LibJF Config Legacy Shim 3.2.1
libjf-config-reflect-v1: LibJF Config Reflect 3.2.1
libjf-data-manipulation-v0: LibJF Data Manipulation 3.2.1
libjf-data-v0: LibJF Data 3.2.1
libjf-translate-v1: LibJF Translate 3.2.1
libjf-unsafe-v0: LibJF Unsafe 3.2.1
libjf-web-v0: LibJF Web 3.2.1
linearxp: Linear XP 1.0.1
lithium: Lithium 0.10.4
logprot: Logprot Mod 1.19-1.9
lootr: Lootr 0.4.25.64
loud_leads: Loud Leads 1.0.1+mc1.19
map_atlases: Map Atlases 2.3.0
megaparrot: Megaparrot 1.0.7-1.19.2
midnightlib: MidnightLib 1.0.0
minecarttweaks: Cammie's Minecart Tweaks 1.7
minecraft: Minecraft 1.19.2
mixintrace: MixinTrace 1.1.1+1.17
naturalist: Naturalist 2.1.1
noenchantcap: No Enchant Cap 2.2.4
com_github_llamalad7_mixinextras: MixinExtras 0.1.1
notenoughbreeding: Not Enough Breeding 1.19.2-1.0.0-fabric
nullscape: Nullscape 1.2
peacefulsurface: PeacefulSurface 1.19.2-v1-fabric
perfectaccuracy: Perfect Accuracy 1.2-1.19
perplayerspawns: Example Mod 3.0.3
phantomredux: Phantom Redux 1.0.0+all-versions+fabric
philipsruins: Philip`s ruins 1.19.2
pickyourpoison: Pick Your Poison 1.0.11
cardinal-components-base: Cardinal Components API (base) 5.0.2
cardinal-components-entity: Cardinal Components API (entities) 5.0.2
org_json_json: json 20211205
player-animator: Player Animator 0.4.0
playerex: PlayerEx 3.3.8
net_objecthunter_exp4j: exp4j 0.4.8
opc: Offline Player Cache 0.6.4
placeholder-api: Placeholder API 2.0.0-pre.1+1.19.2
potionload: Potion Load Mod 1.1-1.19
precise_armor: Precise Armor 1.0
progressivebosses: Progressive Bosses 1.0.0
completeconfig-base: completeconfig-base 2.0.1
projectile_damage: Projectile Damage Attribute 3.0.0+1.19
puzzleslib: Puzzles Lib 4.3.12
realisticsleep: Realistic Sleep 1.6.0
relicex: RelicEx 3.2.6
armorrenderlib: Armor Render Lib 0.2.6
revive: Revive 1.0.5
skylorlib: SkyLib 1.5.1
smallships: Small Ships 2.0.0a1.1.1
smoothchunk: Smooth chunk save Mod 1.19.1-2.0
smwyg: Show Me What You Got 1.0.3
snowyleavesplus: SnowyLeavesPlus 0.1.4
soulfired: Soul fire'd 1.1.0.0
sound_physics_remastered: Sound Physics Remastered 1.19.2-1.0.18
spiderstpo: Spiders 2.0 1.19.2-2.0.3
structory: Structory 1.0.1
takesapillage: Takes a Pillage 1.0.4
themissingvillages: BigReefer's The Missing Villages Mod 2.0.0
treechop: HT's TreeChop 0.17.0
trinkets: Trinkets 3.4.1
variablespawnerhardness: Variable Spawner Hardness 1.19.2-1.2.2
variant_bookshelves: Variant Bookshelves 1.2.4
variantbarrels: Variant Barrels 2.4.5
variantcraftingtables: Variant Crafting Tables 3.2.9
villager-hats: Villager Hats 1.4.1
vtaw_mw: Variant Tools and Weaponry - Extra Weapons 1.0.0
walllanterns: Lanterns Belong on Walls 1.4.0-1.19
wandering_collector: Wandering Collector 1.1.3+mc1.19
tweed4_annotated: tweed4_annotated 1.3.1+mc22w17a
tweed4_base: tweed4_base 1.6.0+mc22w17a
tweed4_data: tweed4_data 1.2.1+mc22w17a
tweed4_data_hjson: tweed4_data_hjson 1.1.1+mc22w17a
yungsapi: YUNG's API 1.19.2-Fabric-3.8.2
org_javassist_javassist: javassist 3.28.0-GA
org_reflections_reflections: reflections 0.10.2
yungsextras: YUNG's Extras 1.19.2-Fabric-3.1.0
zombiehorsespawn-fabric: Zombie Horse Spawn (Fabric) 3.6
Server Running: true
Player Count: 1 / 60; [class_3222['Chahke'/545, l='ServerLevel[HibisWorld]', x=-5273.50, y=63.22, z=-403.50]]
Data Packs: vanilla, Fabric Mods
World Generation: Experimental
Is Modded: Definitely; Server brand changed to 'fabric'
Type: Dedicated Server (map_server.txt)

Sorry this got missposted to this github.

I had some more crashes, it doesn't seem to happen all the time, only with some players. and regardless of if they've manually opened the map as well. I still need to test if it's something to do with having the map in their trinket slot on log off. It also might have something to do with the version of my modpack player's are using as it seems to have happened with only players that have manually installed my newest version. However they should have a one to one duplicate of what i'm personally running, so I don't see why they'd cause a crash and I don't. I'll do some more testing and upload crash reports.

crash-2022-12-30_12.39.43-server.txt