Crash during world creation, only on standalone servers: Exception generating new chunk

[Mad Alchemist]

After I have ported most of my mod to 1.16.5, I am getting a strange crash during world creation (or shortly after) on standalone servers. Single-player is OK.

Here is latest.log (and there was no debug.log in logs directory):

Spoiler

[15:46:41] [main/INFO]: ModLauncher running: args [--launchTarget, forgeserver, --fml.forgeVersion, 37.1.1, --fml.mcVersion, 1.17.1, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20210706.113038]
[15:46:41] [main/INFO]: ModLauncher 9.0.7+91+master.8569cdf starting: java version 16.0.2 by Oracle Corporation
[15:46:41] [main/INFO]: SpongePowered MIXIN Subsystem Version=0.8.4 Source=union:/C:/Games/mineserver/libraries/org/spongepowered/mixin/0.8.4/mixin-0.8.4.jar%2319! Service=ModLauncher Env=SERVER
[15:46:41] [main/INFO]: Found mod file zombienation-1.17.1-2.0.3.1.jar of type MOD with locator {mods folder locator at C:\Games\mineserver\mods}
[15:46:41] [main/INFO]: Found mod file fmlcore-1.17.1-37.1.1.jar of type LIBRARY with locator net.minecraftforge.fml.loading.moddiscovery.MinecraftLocator@62ea3440
[15:46:41] [main/INFO]: Found mod file javafmllanguage-1.17.1-37.1.1.jar of type LANGPROVIDER with locator net.minecraftforge.fml.loading.moddiscovery.MinecraftLocator@62ea3440
[15:46:41] [main/INFO]: Found mod file mclanguage-1.17.1-37.1.1.jar of type LANGPROVIDER with locator net.minecraftforge.fml.loading.moddiscovery.MinecraftLocator@62ea3440
[15:46:41] [main/INFO]: Found mod file server-1.17.1-20210706.113038-srg.jar of type MOD with locator net.minecraftforge.fml.loading.moddiscovery.MinecraftLocator@62ea3440
[15:46:41] [main/INFO]: Found mod file forge-1.17.1-37.1.1-universal.jar of type MOD with locator net.minecraftforge.fml.loading.moddiscovery.MinecraftLocator@62ea3440
[15:46:43] [main/INFO]: Launching target 'forgeserver' with arguments []
[15:46:52] [modloading-worker-1/INFO]: Forge mod loading, version 37.1.1, for MC 1.17.1 with MCP 20210706.113038
[15:46:52] [modloading-worker-1/INFO]: MinecraftForge v37.1.1 Initialized
[15:46:54] [Forge Version Check/INFO]: [forge] Starting version check at https://files.minecraftforge.net/net/minecraftforge/forge/promotions_slim.json
[15:46:55] [Forge Version Check/INFO]: [forge] Found status: UP_TO_DATE Current: 37.1.1 Target: null
[15:46:57] [main/INFO]: Environment: authHost='https://authserver.mojang.com', accountsHost='https://api.mojang.com', sessionHost='https://sessionserver.mojang.com', servicesHost='https://api.minecraftservices.com', name='PROD'
[15:46:57] [main/WARN]: Assets URL 'union:/C:/Games/mineserver/libraries/net/minecraft/server/1.17.1-20210706.113038/server-1.17.1-20210706.113038-srg.jar%2327!/assets/.mcassetsroot' uses unexpected schema
[15:46:57] [main/WARN]: Assets URL 'union:/C:/Games/mineserver/libraries/net/minecraft/server/1.17.1-20210706.113038/server-1.17.1-20210706.113038-srg.jar%2327!/data/.mcassetsroot' uses unexpected schema
[15:46:58] [main/WARN]: Ambiguity between arguments [teleport, location] and [teleport, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[15:46:58] [main/WARN]: Ambiguity between arguments [teleport, location] and [teleport, targets] with inputs: [0.1 -0.5 .9, 0 0 0]
[15:46:58] [main/WARN]: Ambiguity between arguments [teleport, destination] and [teleport, targets] with inputs: [Player, 0123, @e, dd12be42-52a9-4a91-a8a1-11c01849e498]
[15:46:58] [main/WARN]: Ambiguity between arguments [teleport, targets] and [teleport, destination] with inputs: [Player, 0123, dd12be42-52a9-4a91-a8a1-11c01849e498]
[15:46:58] [main/WARN]: Ambiguity between arguments [teleport, targets, location] and [teleport, targets, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[15:46:58] [main/INFO]: Reloading ResourceManager: Default, zombienation-1.17.1-2.0.3.1.jar, forge-1.17.1-37.1.1-universal.jar
[15:47:01] [Worker-Main-6/INFO]: Loaded 7 recipes
[15:47:04] [Worker-Main-6/INFO]: Loaded 1137 advancements
[15:47:06] [Server thread/INFO]: Starting minecraft server version 1.17.1
[15:47:06] [Server thread/INFO]: Loading properties
[15:47:06] [Server thread/INFO]: Default game type: SURVIVAL
[15:47:06] [Server thread/INFO]: Generating keypair
[15:47:06] [Server thread/INFO]: Starting Minecraft server on *:25565
[15:47:06] [Server thread/INFO]: Using default channel type
[15:47:06] [Server thread/WARN]: Configuration file .\world\serverconfig\forge-server.toml is not correct. Correcting
[15:47:06] [Server thread/WARN]: Incorrect key server was corrected from null to its default, SimpleCommentedConfig:{}. 
[15:47:06] [Server thread/WARN]: Incorrect key server.removeErroringBlockEntities was corrected from null to its default, false. 
[15:47:06] [Server thread/WARN]: Incorrect key server.fullBoundingBoxLadders was corrected from null to its default, false. 
[15:47:06] [Server thread/WARN]: Incorrect key server.zombieBaseSummonChance was corrected from null to its default, 0.1. 
[15:47:06] [Server thread/WARN]: Incorrect key server.zombieBabyChance was corrected from null to its default, 0.05. 
[15:47:06] [Server thread/WARN]: Incorrect key server.treatEmptyTagsAsAir was corrected from null to its default, false. 
[15:47:06] [Server thread/WARN]: Incorrect key server.fixAdvancementLoading was corrected from null to its default, true. 
[15:47:06] [Server thread/INFO]: Preparing level "world"
[15:47:13] [Server thread/INFO]: Preparing start region for dimension minecraft:overworld
[15:47:13] [Worker-Main-6/INFO]: Preparing spawn area: 0%
[15:47:14] [Worker-Main-6/INFO]: Preparing spawn area: 0%
[15:47:14] [Worker-Main-6/INFO]: Preparing spawn area: 0%
[15:47:15] [Worker-Main-6/INFO]: Preparing spawn area: 0%
[15:47:15] [Worker-Main-5/INFO]: Preparing spawn area: 0%
[15:47:15] [Worker-Main-5/INFO]: Preparing spawn area: 0%
[15:47:16] [Worker-Main-4/INFO]: Preparing spawn area: 0%
[15:47:17] [Worker-Main-6/INFO]: Preparing spawn area: 0%
[15:47:17] [Worker-Main-6/INFO]: Preparing spawn area: 2%
[15:47:17] [Worker-Main-6/INFO]: Preparing spawn area: 2%
[15:47:18] [Worker-Main-6/INFO]: Preparing spawn area: 3%
[15:47:18] [Worker-Main-5/WARN]: Worker-Main-5 died
java.util.concurrent.CompletionException: net.minecraft.ReportedException: Exception generating new chunk
    at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314) ~[?:?]
    at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319) ~[?:?]
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1155) ~[?:?]
    at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) ~[?:?]
    at net.minecraft.server.level.ChunkTaskPriorityQueueSorter.m_143188_(SourceFile:58) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.util.thread.ProcessorMailbox.m_18759_(SourceFile:91) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.util.thread.ProcessorMailbox.m_18747_(SourceFile:146) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.util.thread.ProcessorMailbox.run(SourceFile:102) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1434) ~[?:?]
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:295) ~[?:?]
    at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016) ~[?:?]
    at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665) ~[?:?]
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598) ~[?:?]
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) [?:?]
Caused by: net.minecraft.ReportedException: Exception generating new chunk
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$18(ChunkMap.java:529) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[server-1.17.1-20210706.113038-extra.jar%2324!:?]
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$20(ChunkMap.java:515) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146) ~[?:?]
    ... 11 more
Caused by: java.lang.IllegalArgumentException: bound must be positive
    at java.util.Random.nextInt(Random.java:388) ~[?:?]
    at net.minecraft.world.level.NaturalSpawner.m_151616_(NaturalSpawner.java:335) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.levelgen.NoiseBasedChunkGenerator.m_6929_(NoiseBasedChunkGenerator.java:504) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.chunk.ChunkStatus.m_156220_(ChunkStatus.java:99) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.chunk.ChunkStatus$SimpleGenerationTask.m_142357_(ChunkStatus.java:255) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.chunk.ChunkStatus.m_156212_(ChunkStatus.java:208) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$18(ChunkMap.java:517) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[server-1.17.1-20210706.113038-extra.jar%2324!:?]
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$20(ChunkMap.java:515) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146) ~[?:?]
    ... 11 more
[15:47:18] [Worker-Main-5/FATAL]: Preparing crash report with UUID 9c10d35f-0a18-42b9-a7af-289a7cef4872
[15:47:18] [Worker-Main-4/INFO]: Preparing spawn area: 3%
[15:47:18] [Worker-Main-6/WARN]: Worker-Main-6 died
java.util.concurrent.CompletionException: net.minecraft.ReportedException: Exception generating new chunk
    at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314) ~[?:?]
    at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319) ~[?:?]
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1155) ~[?:?]
    at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) ~[?:?]
    at net.minecraft.server.level.ChunkTaskPriorityQueueSorter.m_143188_(SourceFile:58) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.util.thread.ProcessorMailbox.m_18759_(SourceFile:91) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.util.thread.ProcessorMailbox.m_18747_(SourceFile:146) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.util.thread.ProcessorMailbox.run(SourceFile:102) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1434) ~[?:?]
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:295) ~[?:?]
    at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016) ~[?:?]
    at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665) ~[?:?]
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598) ~[?:?]
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) [?:?]
Caused by: net.minecraft.ReportedException: Exception generating new chunk
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$18(ChunkMap.java:529) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[server-1.17.1-20210706.113038-extra.jar%2324!:?]
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$20(ChunkMap.java:515) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146) ~[?:?]
    ... 11 more
Caused by: java.lang.IllegalArgumentException: bound must be positive
    at java.util.Random.nextInt(Random.java:388) ~[?:?]
    at net.minecraft.world.level.NaturalSpawner.m_151616_(NaturalSpawner.java:335) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.levelgen.NoiseBasedChunkGenerator.m_6929_(NoiseBasedChunkGenerator.java:504) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.chunk.ChunkStatus.m_156220_(ChunkStatus.java:99) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.chunk.ChunkStatus$SimpleGenerationTask.m_142357_(ChunkStatus.java:255) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.chunk.ChunkStatus.m_156212_(ChunkStatus.java:208) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$18(ChunkMap.java:517) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[server-1.17.1-20210706.113038-extra.jar%2324!:?]
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$20(ChunkMap.java:515) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146) ~[?:?]
    ... 11 more
[15:47:19] [Worker-Main-6/FATAL]: Preparing crash report with UUID 45de03c8-6d00-4f2b-81e5-29f0cd56ef5b
[15:47:19] [Worker-Main-4/INFO]: Preparing spawn area: 3%
[15:47:19] [Worker-Main-10/WARN]: Worker-Main-10 died
java.util.concurrent.CompletionException: net.minecraft.ReportedException: Exception generating new chunk
    at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314) ~[?:?]
    at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319) ~[?:?]
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1155) ~[?:?]
    at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) ~[?:?]
    at net.minecraft.server.level.ChunkTaskPriorityQueueSorter.m_143188_(SourceFile:58) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.util.thread.ProcessorMailbox.m_18759_(SourceFile:91) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.util.thread.ProcessorMailbox.m_18747_(SourceFile:146) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.util.thread.ProcessorMailbox.run(SourceFile:102) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1434) ~[?:?]
    at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:295) ~[?:?]
    at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016) ~[?:?]
    at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665) ~[?:?]
    at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598) ~[?:?]
    at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) [?:?]
Caused by: net.minecraft.ReportedException: Exception generating new chunk
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$18(ChunkMap.java:529) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[server-1.17.1-20210706.113038-extra.jar%2324!:?]
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$20(ChunkMap.java:515) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146) ~[?:?]
    ... 11 more
Caused by: java.lang.IllegalArgumentException: bound must be positive
    at java.util.Random.nextInt(Random.java:388) ~[?:?]
    at net.minecraft.world.level.NaturalSpawner.m_151616_(NaturalSpawner.java:335) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.levelgen.NoiseBasedChunkGenerator.m_6929_(NoiseBasedChunkGenerator.java:504) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.chunk.ChunkStatus.m_156220_(ChunkStatus.java:99) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.chunk.ChunkStatus$SimpleGenerationTask.m_142357_(ChunkStatus.java:255) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.world.level.chunk.ChunkStatus.m_156212_(ChunkStatus.java:208) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$18(ChunkMap.java:517) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[server-1.17.1-20210706.113038-extra.jar%2324!:?]
    at net.minecraft.server.level.ChunkMap.lambda$scheduleChunkGeneration$20(ChunkMap.java:515) ~[server-1.17.1-20210706.113038-srg.jar%2327!:?]
    at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146) ~[?:?]
    ... 11 more
 

I can't even figure out which feature of mod is bugged, as my mod isn't even mentioned in crash report. Or it is bad version of forge?
I tried to run my mod on 1.17.1-37.1.1, and here is source code of all my mod if you need it: https://github.com/MadAlchemist/Zombienation/tree/1.17.1

(Don't judge too harshly for bad coding practices, if nobody would start modding before mastered java, all we would have today is vanilla MC)