[SOLVED][1.15.2] IllegalStateException: Entity is already tracked!

[Slexom]

Testing a function to expand the entities pool from eggs. Spamming eggs, in creative mode, and it seems to work, the extra entities appear. Than game crash.
 

Crash Report

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---- Minecraft Crash Report ---- // I let you down. Sorry Time: 11/06/20 16.17 Description: Exception ticking world java.lang.IllegalStateException: Entity is already tracked! at net.minecraft.world.server.ChunkManager.track(ChunkManager.java:959) ~[?:?] {re:classloading} at net.minecraft.world.server.ServerChunkProvider.track(ServerChunkProvider.java:457) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.world.server.ServerWorld.onEntityAdded(ServerWorld.java:1020) ~[?:?] {re:classloading} at net.minecraft.world.server.ServerWorld.tick(ServerWorld.java:367) ~[?:?] {re:classloading} at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:886) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:821) ~[?:?] {re:classloading,pl:accesstransformer:B} at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120) ~[?:?] {re:classloading,pl:runtimedistcleaner:A} at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:662) [?:?] {re:classloading,pl:accesstransformer:B} at java.lang.Thread.run(Thread.java:748) [?:1.8.0_231] {} A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Server thread Stacktrace: at net.minecraft.world.server.ChunkManager.track(ChunkManager.java:959) at net.minecraft.world.server.ServerChunkProvider.track(ServerChunkProvider.java:457) at net.minecraft.world.server.ServerWorld.onEntityAdded(ServerWorld.java:1020) at net.minecraft.world.server.ServerWorld.tick(ServerWorld.java:367) -- Affected level -- Details: All players: 1 total; [ServerPlayerEntity['Dev'/309, l='Nuovo mondo', x=-182.08, y=64.28, z=-72.93]] Chunk stats: ServerChunkCache: 2025 Level dimension: DimensionType{minecraft:overworld} Level name: Nuovo mondo Level seed: -2516639339047440122 Level generator: ID 00 - default, ver 1. Features enabled: true Level generator options: {} Level spawn location: World: (-169,63,-48), Chunk: (at 7,3,0 in -11,-3; contains blocks -176,0,-48 to -161,255,-33), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1) Level time: 537680 game time, 609 day time Known server brands: forge Level was modded: true Level storage version: 0x04ABD - Anvil Level weather: Rain time: 1 (now: false), thunder time: 1 (now: false) Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true Stacktrace: at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:886) at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:821) at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:120) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:662) at java.lang.Thread.run(Thread.java:748) -- 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_231, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 324280200 bytes (309 MB) / 1091043328 bytes (1040 MB) up to 1763704832 bytes (1682 MB) CPUs: 4 JVM Flags: 1 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump ModLauncher: 5.1.0+69+master.79f13f7 ModLauncher launch target: fmluserdevclient ModLauncher naming: mcp ModLauncher services: /eventbus-2.2.0-service.jar eventbus PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar object_holder_definalize PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar runtime_enum_extender PLUGINSERVICE /accesstransformers-2.1.1-shadowed.jar accesstransformer PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar capability_inject_definalize PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar runtimedistcleaner PLUGINSERVICE /forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-launcher.jar fml TRANSFORMATIONSERVICE FML: 31.2 Forge: net.minecraftforge:31.2.0 FML Language Providers: javafml@31.2 minecraft@1 Mod List: client-extra.jar Minecraft {minecraft@1.15.2 DONE} forge-1.15.2-31.2.0_mapped_snapshot_20200514-1.15.1-recomp.jar Forge {forge@31.2.0 DONE} main Earth2Java Mobs {earthtojavamobs@1.2.0 DONE} Player Count: 1 / 8; [ServerPlayerEntity['Dev'/309, l='Nuovo mondo', x=-182.08, y=64.28, z=-72.93]] Data Packs: vanilla, mod:forge (incompatible), mod:earthtojavamobs Type: Integrated Server (map_client.txt) Is Modded: Definitely; Client brand changed to 'forge'

 

Code

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Could it be beacuse it fire more than once?
This a check I've added, a simple println

[16:38:01] [Server thread/INFO] [earthtojavamobs Mod Event Subscriber/]: true
[16:38:01] [Render thread/INFO] [earthtojavamobs Mod Event Subscriber/]: true

 

Edited June 11, 2020 by Slexom
Solved

[Slexom]

Solved. It trigger on the 1/32 case, when the game generate 4 chicken at once. Moving the chicken selection inside the inner for solved the issue.