Server crashes in certain area inconsistently

[calmbat]

Minecraft Logs

---- Minecraft Crash Report ----
// Why did you do that?

Time: 2025-01-09 15:12:48
Description: Exception ticking world

java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.longs.LongArrayList.getLong(int)" because "this.wrapped" is null
	at knot//it.unimi.dsi.fastutil.longs.LongOpenHashSet$SetIterator.nextLong(LongOpenHashSet.java:551)
	at knot//it.unimi.dsi.fastutil.longs.LongCollection.removeIf(LongCollection.java:274)
	at knot//net.minecraft.class_5579.method_31851(class_5579.java:338)
	at knot//net.minecraft.class_5579.method_31809(class_5579.java:358)
	at knot//net.minecraft.class_3218.method_18765(class_3218.java:416)
	at knot//net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:1069)
	at knot//net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:953)
	at knot//net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:713)
	at knot//net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:292)
	at java.base/java.lang.Thread.run(Thread.java:1583)


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

-- Head --
Thread: Server thread
Stacktrace:
	at knot//it.unimi.dsi.fastutil.longs.LongOpenHashSet$SetIterator.nextLong(LongOpenHashSet.java:551)
	at knot//it.unimi.dsi.fastutil.longs.LongCollection.removeIf(LongCollection.java:274)
	at knot//net.minecraft.class_5579.method_31851(class_5579.java:338)
	at knot//net.minecraft.class_5579.method_31809(class_5579.java:358)

-- Affected level --
Details:
	All players: 1 total; [class_3222['calmbat'/21429, l='ServerLevel[world]', x=968.63, y=248.00, z=3055.58]]
	Chunk stats: 702
	Level dimension: minecraft:overworld
	Level spawn location: World: (368,63,624), Section: (at 0,15,0 in 23,3,39; chunk contains blocks 368,-64,624 to 383,319,639), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,-64,512 to 511,319,1023)
	Level time: 3981366 game time, 10953 day time
	Level name: world
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Commands: false
	Level weather: Rain time: 68277 (now: false), thunder time: 76595 (now: false)
	Known server brands: fabric
	Removed feature flags: 
	Level was modded: true
	Level storage version: 0x04ABD - Anvil
	Loaded entity count: 153
Stacktrace:
	at knot//net.minecraft.class_3218.method_8538(class_3218.java:1744)
	at knot//net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:1072)
	at knot//net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:953)
	at knot//net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:713)
	at knot//net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:292)
	at java.base/java.lang.Thread.run(Thread.java:1583)

-- System Details --
Details:
	Minecraft Version: 1.21.4
	Minecraft Version ID: 1.21.4
	Operating System: Linux (amd64) version 6.1.0-25-amd64
	Java Version: 21.0.5, Eclipse Adoptium
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode, sharing), Eclipse Adoptium
	Memory: 1590565848 bytes (1516 MiB) / 2789212160 bytes (2660 MiB) up to 6442450944 bytes (6144 MiB)
	CPUs: 8
	Processor Vendor: AuthenticAMD
	Processor Name: AMD Ryzen 9 5900X 12-Core Processor
	Identifier: AuthenticAMD Family 25 Model 33 Stepping 2
	Microarchitecture: Zen 3
	Frequency (GHz): -0.00
	Number of physical packages: 1
	Number of physical CPUs: 12
	Number of logical CPUs: 24
	Graphics card #0 name: unknown
	Graphics card #0 vendor: unknown
	Graphics card #0 VRAM (MiB): 0.00
	Graphics card #0 deviceId: unknown
	Graphics card #0 versionInfo: unknown
	Virtual memory max (MiB): 105311.14
	Virtual memory used (MiB): 87872.95
	Swap memory total (MiB): 40960.00
	Swap memory used (MiB): 4886.50
	Space in storage for jna.tmpdir (MiB): <path not set>
	Space in storage for org.lwjgl.system.SharedLibraryExtractPath (MiB): <path not set>
	Space in storage for io.netty.native.workdir (MiB): <path not set>
	Space in storage for java.io.tmpdir (MiB): available: 369482.56, total: 477604.03
	Space in storage for workdir (MiB): available: 26976.32, total: 31170.02
	JVM Flags: 6 total; -Xmx6144M -Xms1024M -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1MixedGCLiveThresholdPercent=90 -XX:+DisableExplicitGC
	Fabric Mods: 
		architectury: Architectury 15.0.1
		balm-fabric: Balm 21.4.5
			kuma_api: KumaAPI 21.4.4
		basicweapons: Basic Weapons 1.2.12+1.21.4
		beautify: Beautify 1.5.0+1.21.4
		bigendcitiesmod: Bigger Better End Cities 1.21.4-1.1.0
		blahaj: Blåhaj 3.0.0+1.21.4
		c2me: Concurrent Chunk Management Engine 0.3.0+rc.1.0+1.21.3
			c2me-base: Concurrent Chunk Management Engine (Base) 0.3.0+rc.1.0+1.21.3
			c2me-fixes-chunkio-threading-issues: Concurrent Chunk Management Engine (Fixes/Chunk IO/Threading Issues) 0.3.0+rc.1.0+1.21.3
			c2me-fixes-general-threading-issues: Concurrent Chunk Management Engine (Fixes/General/Threading Issues) 0.3.0+rc.1.0+1.21.3
			c2me-fixes-worldgen-threading-issues: Concurrent Chunk Management Engine (Fixes/WorldGen/Threading Issues) 0.3.0+rc.1.0+1.21.3
			c2me-fixes-worldgen-vanilla-bugs: Concurrent Chunk Management Engine (Fixes/WorldGen/Vanilla Bugs) 0.3.0+rc.1.0+1.21.3
			c2me-notickvd: Concurrent Chunk Management Engine (No Tick View Distance) 0.3.0+rc.1.0+1.21.3
			c2me-opts-allocs: Concurrent Chunk Management Engine (Optimizations/Memory Allocations) 0.3.0+rc.1.0+1.21.3
			c2me-opts-chunk-access: Concurrent Chunk Management Engine (Optimizations/Chunk Access) 0.3.0+rc.1.0+1.21.3
			c2me-opts-chunkio: Concurrent Chunk Management Engine (Optimizations/Chunk IO) 0.3.0+rc.1.0+1.21.3
			c2me-opts-dfc: Concurrent Chunk Management Engine (Optimizations/Density Function Compiler) 0.3.0+rc.1.0+1.21.3
			c2me-opts-math: Concurrent Chunk Management Engine (Optimizations/Math) 0.3.0+rc.1.0+1.21.3
			c2me-opts-scheduling: Concurrent Chunk Management Engine (Optimizations/Scheduling) 0.3.0+rc.1.0+1.21.3
			c2me-opts-worldgen-general: Concurrent Chunk Management Engine (Optimizations/General WorldGen) 0.3.0+rc.1.0+1.21.3
			c2me-opts-worldgen-vanilla: Concurrent Chunk Management Engine (Optimizations/Vanilla WorldGen) 0.3.0+rc.1.0+1.21.3
			c2me-rewrites-chunk-serializer: Concurrent Chunk Management Engine (Rewrites/Chunk Serializer) 0.3.0+rc.1.0+1.21.3
			c2me-rewrites-chunk-system: Concurrent Chunk Management Engine (Rewrites/Chunk System) 0.3.0+rc.1.0+1.21.3
			c2me-rewrites-chunkio: Concurrent Chunk Management Engine (Rewrites/Chunk IO) 0.3.0+rc.1.0+1.21.3
			c2me-server-utils: Concurrent Chunk Management Engine (Server Utils) 0.3.0+rc.1.0+1.21.3
			c2me-threading-lighting: Concurrent Chunk Management Engine (Threading/Lighting) 0.3.0+rc.1.0+1.21.3
			com_ibm_async_asyncutil: asyncutil 0.1.0
			io_reactivex_rxjava3_rxjava: rxjava 3.1.8
			mixinsquared: MixinSquared 0.2.0-beta.6
			net_objecthunter_exp4j: exp4j 0.4.8
			org_jctools_jctools-core: jctools-core 4.0.5
			org_reactivestreams_reactive-streams: reactive-streams 1.0.4
		chatanimation: ChatAnimation 1.0.6
		cloth-config: Cloth Config v17 17.0.144
			cloth-basic-math: cloth-basic-math 0.6.1
		collective: Collective 7.89
		cristellib: Cristel Lib 1.2.10
		cyclepaintings: Cycle Paintings 3.6
		entityculling: EntityCulling 1.7.2
		fabric-api: Fabric API 0.114.0+1.21.4
			fabric-api-base: Fabric API Base 0.4.54+b47eab6b04
			fabric-api-lookup-api-v1: Fabric API Lookup API (v1) 1.6.86+b1caf1e904
			fabric-biome-api-v1: Fabric Biome API (v1) 15.0.6+b1c29d8e04
			fabric-block-api-v1: Fabric Block API (v1) 1.0.31+7feeb73304
			fabric-block-view-api-v2: Fabric BlockView API (v2) 1.0.19+7feeb73304
			fabric-command-api-v1: Fabric Command API (v1) 1.2.62+f71b366f04
			fabric-command-api-v2: Fabric Command API (v2) 2.2.41+e496eb1504
			fabric-commands-v0: Fabric Commands (v0) 0.2.79+df3654b304
			fabric-content-registries-v0: Fabric Content Registries (v0) 9.1.14+7feeb73304
			fabric-convention-tags-v1: Fabric Convention Tags 2.1.11+7f945d5b04
			fabric-convention-tags-v2: Fabric Convention Tags (v2) 2.10.1+e7d3c6e504
			fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.3.6+7feeb73304
			fabric-data-attachment-api-v1: Fabric Data Attachment API (v1) 1.4.6+9aea556b04
			fabric-data-generation-api-v1: Fabric Data Generation API (v1) 22.2.4+20ea1e2304
			fabric-dimensions-v1: Fabric Dimensions API (v1) 4.0.10+7feeb73304
			fabric-entity-events-v1: Fabric Entity Events (v1) 2.0.12+60fccc7604
			fabric-events-interaction-v0: Fabric Events Interaction (v0) 4.0.2+a4eebcf004
			fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.62+7feeb73304
			fabric-item-api-v1: Fabric Item API (v1) 11.1.14+203e6b2304
			fabric-item-group-api-v1: Fabric Item Group API (v1) 4.1.23+7feeb73304
			fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 2.5.4+bf2a60eb04
			fabric-loot-api-v2: Fabric Loot API (v2) 3.0.33+3f89f5a504
			fabric-loot-api-v3: Fabric Loot API (v3) 1.0.21+203e6b2304
			fabric-message-api-v1: Fabric Message API (v1) 6.0.25+7feeb73304
			fabric-networking-api-v1: Fabric Networking API (v1) 4.3.9+f371ccb904
			fabric-object-builder-api-v1: Fabric Object Builder API (v1) 18.0.8+d70d2c0604
			fabric-particles-v1: Fabric Particles (v1) 4.0.14+7feeb73304
			fabric-recipe-api-v1: Fabric Recipe API (v1) 8.0.6+9ceeb58c04
			fabric-registry-sync-v0: Fabric Registry Sync (v0) 6.1.3+e7d3c6e504
			fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.3.57+73761d2e04
			fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 3.1.19+7feeb73304
			fabric-resource-conditions-api-v1: Fabric Resource Conditions API (v1) 5.0.13+203e6b2304
			fabric-resource-loader-v0: Fabric Resource Loader (v0) 3.0.11+b1caf1e904
			fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.3.110+7feeb73304
			fabric-tag-api-v1: Fabric Tag API (v1) 1.0.2+20ea1e2304
			fabric-transfer-api-v1: Fabric Transfer API (v1) 5.4.9+efa825c904
			fabric-transitive-access-wideners-v1: Fabric Transitive Access Wideners (v1) 6.3.2+56e78b9b04
		fabricloader: Fabric Loader 0.16.10
			mixinextras: MixinExtras 0.4.1
		framework: Framework 0.10.1
			com_electronwill_night-config_core: core 3.7.1
			com_electronwill_night-config_toml: toml 3.7.1
			org_javassist_javassist: javassist 3.29.2-GA
			org_reflections_reflections: reflections 0.10.2
		hopobettermineshaft: Hopo Better Mineshaft 1.2.9
		hopobetterruinedportal: Hopo Better Ruined Portal 1.4.5
		hopobetterunderwaterruins: Hopo Better Underwater Ruins 1.2.2
		incendium: Incendium 5.4.3
		jamlib: JamLib 1.2.2+1.21.4
			blue_endless_jankson: jankson 1.2.3
		java: OpenJDK 64-Bit Server VM 21
		lithium: Lithium 0.14.3+mc1.21.4
		livingthings: Living Things 1.21.4-2.2.0
		mavapi: More Axolotl Variants API 1.2.0
		mavm: More Axolotl Variants Mod 1.3.1
		mcwpaintings: Macaw's Paintings 1.0.5
		minecraft: Minecraft 1.21.4
		morediscs: More Music Discs 1.21.4-34-fabric
		nochatreports: No Chat Reports 1.21.3-v2.10.1
		noisium: Noisium 2.5.0+mc1.21.4
		notenoughanimations: NotEnoughAnimations 1.9.0
		nullscape: Nullscape 1.2.10
		refurbished_furniture: MrCrayfish's Furniture Mod: Refurbished 1.0.9
		rightclickharvest: Right Click Harvest 4.4.4+1.21.4
		shulkerboxtooltip: Shulker Box Tooltip 5.2.2+1.21.4
		sit: Sit 1.21.3-29
		skinlayers3d: 3d-Skin-Layers 1.7.4
		sound_physics_remastered: Sound Physics Remastered 1.21.4-1.4.8
		structory: Structory 1.3.9
		t_and_t: Towns and Towers 1.13.3
		terralith: Terralith 2.5.7
		threadtweak: ThreadTweak 0.1.5+mc1.21.3
		trade_cycling: Trade Cycling 1.21.4-1.0.15
		wafflesmoss: Waffle's Moss 1.0
		waystones: Waystones 21.4.1
		wildfire_gender: Wildfire's Female Gender Mod 4.3.3+1.21.4
	Server Running: true
	Player Count: 1 / 16; [class_3222['calmbat'/21429, l='ServerLevel[world]', x=968.63, y=248.00, z=3055.58]]
	Active Data Packs: vanilla, fabric, balm-fabric (incompatible), basicweapons, beautify, blahaj, collective (incompatible), fabric-convention-tags-v2, hopobettermineshaft, hopobetterruinedportal, hopobetterunderwaterruins, incendium, livingthings (incompatible), mcwpaintings (incompatible), morediscs, nullscape, refurbished_furniture (incompatible), rightclickharvest, structory, t_and_t, terralith, wafflesmoss, waystones (incompatible), towns_and_towers:resources/t_and_t_waystones_patch
	Available Data Packs: balm-fabric (incompatible), basicweapons, beautify, blahaj, collective (incompatible), fabric, fabric-convention-tags-v2, hopobettermineshaft, hopobetterruinedportal, hopobetterunderwaterruins, incendium, livingthings (incompatible), mcwpaintings (incompatible), minecart_improvements, morediscs, nullscape, redstone_experiments, refurbished_furniture (incompatible), rightclickharvest, structory, t_and_t, terralith, towns_and_towers:resources/t_and_t_waystones_patch, trade_rebalance, vanilla, wafflesmoss, waystones (incompatible)
	Enabled Feature Flags: minecraft:vanilla
	World Generation: Experimental
	World Seed: -1765265298707794900
	Suppressed Exceptions: ~~NONE~~
	Is Modded: Definitely; Server brand changed to 'fabric'
	Type: Dedicated Server (map_server.txt)

Description

Very strange issue that ive been trying to solve for a few days, and would very much appreciate an outside perspective. Trying to help a friend who set up a modded server, which has been seemingly crashing at random. There is an area near where they built some houses that crashes when you get near it, but if a player spawns there it seems to be fine. Im leaning towards it being a furniture mod as the area includes the house of a player who has made a bunch of furniture, but honestly I am not sure.

Once again any help would be appreciated, Thanks in advance