I was planning on doing a netherhub on a server, but I got above the bedrock the game states "Saving World." Then the game proceeds to crash.
Here is the crash log:
Thread: Render thread
Stacktrace:
at ru.bulldog.justmap.minimap.data.MapChunk.setLevel(MapChunk.java:135)
at ru.bulldog.justmap.minimap.data.MapCache.getChunk(MapCache.java:179)
at ru.bulldog.justmap.minimap.data.MapCache.getChunk(MapCache.java:167)
at ru.bulldog.justmap.minimap.data.MapCache.getChunk(MapCache.java:163)
at ru.bulldog.justmap.minimap.data.MapCache.update(MapCache.java:107)
at ru.bulldog.justmap.minimap.Minimap.prepareMap(Minimap.java:203)
at ru.bulldog.justmap.minimap.Minimap.update(Minimap.java:79)
at ru.bulldog.justmap.client.JustMapClient.lambda$onInitializeClient$0(JustMapClient.java:21)
at net.fabricmc.fabric.api.event.client.ClientTickCallback.lambda$null$0(ClientTickCallback.java:33)
at net.minecraft.class_310.handler$zmp000$tick(class_310.java:7047)

-- Affected level --
Details:
All players: 1 total; [class_746['Game Name'/551329, l='Server', x=55.44, y=128.00, z=-10.73]]
Chunk stats: Immersive Portals Present 529
Level dimension: minecraft:the_nether
Level name:
Level seed:
Level generator: ID 16 - climatic, ver 0. Features enabled: false
Level generator options: {}
Level spawn location: World: (256,69,-240), Chunk: (at 0,4,0 in 16,-15; contains blocks 256,0,-240 to 271,255,-225), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 81865411 game time, 91037834 day time
Known server brands:
Level was modded: false
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Server brand: fabric
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.class_638.method_8538(class_638.java:450)
at net.minecraft.class_310.method_1587(class_310.java:1921)
at net.minecraft.class_310.method_1514(class_310.java:639)
at net.minecraft.client.main.Main.main(Main.java:204)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:193)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:138)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)

-- System Details --
Details:
Minecraft Version: 1.15.2
Minecraft Version ID: 1.15.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_211, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 256088336 bytes (244 MB) / 893386752 bytes (852 MB) up to 954728448 bytes (910 MB)
CPUs: 6
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms512m -Xmx1024m
Fabric Mods:
adorn: Adorn 1.8.0+1.15.2
appleskin: AppleSkin 1.0.8
autoconfig1: Auto Config v1 1.2.0+mc1.14.4
autoconfig1u: Auto Config v1 Updated 1.2.4
better_wither_skeletons: Better Wither Skeletons 1.0.0
bettergraves: Better Graves 0.2.1-beta.2
betterthanmending: BetterThanMending 1.1.1
blue_endless_jankson: jankson +
bowinfinityfix: Bow Infinity Fix rv8
carpet: Carpet Mod in Fabric 1.3.12
carpet-extra: Carpet Extra 1.3.9
chunkpregen: Fabric Chunk Pregenerator 0.1.2
clipboards: Clipboards 1.0.0+1.15.2
cloth: Cloth Events 1.2.0
cloth-config: Cloth Config 0.2.1+build.14
cloth-config2: Cloth Config v2 2.10
com_moandjiezana_toml_toml4j: toml4j 0.7.2
cotton: Cotton 1.0.2
cotton-cauldron: Cotton Cauldron 1.0.0-rc.6
cotton-commons: Cotton Commons 1.0.0-rc.4
cotton-config: Cotton Config 1.0.0-rc.7
cotton-datapack: Cotton Datapack 1.0.1
cotton-logging: Cotton Logging 1.0.0-rc.4
cotton-player-events: Cotton Player Events 1.0.2
couplings: Couplings 1.3.1
cullparticles: Cull Particles 1.0
cwt: Climatic World Type 1.1.4
desire-paths: Desire Paths 1.5.3
durabilityviewer: Giselbaers Durability Viewer 1.15.2-fabric0.4.23-1.7
epicurean: Epicurean 2.2.4+1.15.2
extradoors: ExtraDoors 1.6.0-1.15
fabric: Fabric API 0.4.32+build.292-1.15
fabric-api-base: Fabric API Base 0.1.2+b7f9825d0c
fabric-biomes-v1: Fabric Biomes (v1) 0.1.5+3b05f68e0c
fabric-blockrenderlayer-v1: Fabric BlockRenderLayer Registration (v1) 1.1.4+c6a8ea890c
fabric-commands-v0: Fabric Commands (v0) 0.1.2+b7f9825d0c
fabric-containers-v0: Fabric Containers (v0) 0.1.3+b7f9825d0c
fabric-content-registries-v0: Fabric Content Registries (v0) 0.1.3+b7f9825d0c
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.1.2+b7f9825d0c
fabric-dimensions-v1: fabric-dimensions-v1 0.2.4+203491ea0c
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.2.7+a1bd31180c
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.1.2+b7f9825d0c
fabric-item-groups-v0: Fabric Item Groups (v0) 0.1.6+ec40b2e10c
fabric-keybindings-v0: Fabric Key Bindings (v0) 0.1.1+dfdb52d60c
fabric-language-kotlin: Fabric Language Kotlin 1.3.61+build.1
fabric-loot-tables-v1: Fabric Loot Tables (v1) 0.1.5+e08a73050c
fabric-mining-levels-v0: Fabric Mining Levels (v0) 0.1.1+b7f9825d0c
fabric-models-v0: Fabric Models (v0) 0.1.0+dfdb52d60c
fabric-networking-blockentity-v0: Fabric Networking Block Entity (v0) 0.2.3+e08a73050c
fabric-networking-v0: Fabric Networking (v0) 0.1.7+12515ed90c
fabric-object-builders-v0: Fabric Object Builders (v0) 0.1.3+e4c9a9c30c
fabric-particles-v1: fabric-particles-v1 0.1.1+dfdb52d60c
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.2.6+f3d8141b0c
fabric-renderer-api-v1: Fabric Renderer API (v1) 0.2.10+f08b61330c
fabric-renderer-indigo: Fabric Renderer - Indigo 0.2.23+9290e2ed0c
fabric-renderer-registries-v1: Fabric Renderer Registries (v1) 2.0.1+5a0f9a600c
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.1.3+b7f9825d0c
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 0.1.6+12515ed90c
fabric-rendering-v0: Fabric Rendering (v0) 1.1.0+534104900c
fabric-rendering-v1: Fabric Rendering (v1) 0.1.0+534104900c
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.1.10+06c939b30c
fabric-tag-extensions-v0: Fabric Tag Extensions (v0) 0.1.3+abd915800c
fabric-textures-v0: Fabric Textures (v0) 1.0.4+821cdba70c
fabricloader: Fabric Loader 0.7.8+build.185
fairenchanting: FairEnchanting 1.1.2
gbfabrictools: GBfabrictools 1.1.0
grass_kiss: Grass Kiss 0.2.2
horsestatsvanilla: Horse Stats Vanilla 1.0.5
immersive_portals: Immersive Portals 0.15
informedload: Informed Load 4.0.0
inventorysorter: Inventory Sorter 1.6.3
jankson: Jankson 2.0.1+j1.2.0
justmap: Just Map 1.0.27
kirin: Kirin UI 1.5.2-1.15.2
libcd: LibCapableData 2.2.2+1.15.2
libgui: LibGui 1.5.1
lightoverlay: Light Overlay 4.2
lithium: Lithium 0.4.2
me_shedaniel_cloth_basic-math: basic-math 0.3.0
minecraft: Minecraft 1.15.2
mm: Manningham Mills 2.0
modmenu: Mod Menu 1.10.1+build.30
notenoughcrashes-api: Not Enough Crashes API 1.0.0
orderly: Orderly 1.2.1+build.4-1.15
org_aeonbits_owner_owner: owner 1.0.8
org_jetbrains_annotations: annotations 18.0.0
org_jetbrains_kotlin_kotlin-reflect: kotlin-reflect 1.3.61
org_jetbrains_kotlin_kotlin-stdlib: kotlin-stdlib 1.3.61
org_jetbrains_kotlin_kotlin-stdlib-jdk7: kotlin-stdlib-jdk7 1.3.61
org_jetbrains_kotlin_kotlin-stdlib-jdk8: kotlin-stdlib-jdk8 1.3.61
org_jetbrains_kotlinx_kotlinx-coroutines-core: kotlinx-coroutines-core 1.3.3
org_jetbrains_kotlinx_kotlinx-coroutines-jdk8: kotlinx-coroutines-jdk8 1.3.3
phosphor: Phosphor 0.3.6
presencefootsteps: Presence Footsteps r22+1.15.2
programmerartinjector: Programmer Art Injector 1.1.0
roughlyenoughitems: Roughly Enough Items 3.6.1
simplystrawberrys: Simply Strawberries 1.0
spinnery: Spinnery 2.0.0+fabric-20w06a
sweettooth: Sweet Tooth 1.1.2
terraform: Terraform 1.4.3+build.29
traverse: Traverse 2.1.11+build.23
trees-do-not-float: Trees Do Not Float 1.8.69
usefulfood: usefulfood 1.0.0
villagerhats: Villager Hats fabric-1.15.0-1.0.0
walljump: Wall-Jump! 1.3.3+1.15
Launched Version: MultiMC5
Backend library: LWJGL version 3.2.2 build 10
Backend API: GeForce GTX 1050 Ti/PCIe/SSE2 GL version 4.6.0 NVIDIA 442.59, NVIDIA Corporation
GL Caps: Using framebuffer using OpenGL 3.0
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'fabric'
Type: Client (map_client.txt)
Resource Packs: