---- Minecraft Crash Report ---- // Shall we play a game? Time: 2026-05-04 18:00:42 Description: Saving entity NBT java.lang.IllegalStateException: Missing id for entity in: {Hamster:{}} at MC-BOOTSTRAP/datafixerupper@8.0.16/com.mojang.serialization.DataResult$Error.getOrThrow(DataResult.java:287) ~[datafixerupper-8.0.16.jar#116!/:?] {} at MC-BOOTSTRAP/datafixerupper@8.0.16/com.mojang.serialization.DataResult.getOrThrow(DataResult.java:81) ~[datafixerupper-8.0.16.jar#116!/:?] {} at TRANSFORMER/neoforge@21.1.228/net.neoforged.neoforge.common.util.DataComponentUtil.wrapEncodingExceptions(DataComponentUtil.java:24) ~[neoforge-21.1.228-universal.jar#178!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.item.ItemStack.save(ItemStack.java:403) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:computing_frames,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.entity.player.Inventory.save(Inventory.java:384) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.entity.player.Player.addAdditionalSaveData(Player.java:843) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:PlayerMixin from mod spawn,pl:mixin:APP:spawn.mixins.json:accessor.PlayerAccessor from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.level.ServerPlayer.addAdditionalSaveData(ServerPlayer.java:390) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:ServerPlayerMixin from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.entity.Entity.saveWithoutId(Entity.java:1723) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:EntityMixin from mod spawn,pl:mixin:APP:spawn.mixins.json:accessor.EntityAccessor from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.client.server.IntegratedPlayerList.save(IntegratedPlayerList.java:28) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.players.PlayerList.remove(PlayerList.java:364) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.network.ServerGamePacketListenerImpl.removePlayerFromWorld(ServerGamePacketListenerImpl.java:1215) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.network.ServerGamePacketListenerImpl.onDisconnect(ServerGamePacketListenerImpl.java:1204) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.Connection.handleDisconnection(Connection.java:643) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.network.ServerConnectionListener.tick(ServerConnectionListener.java:172) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1051) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:MinecraftServerMixin from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:917) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:MinecraftServerMixin from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.client.server.IntegratedServer.tickServer(IntegratedServer.java:110) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading,pl:runtimedistcleaner:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:707) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:MinecraftServerMixin from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:267) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:MinecraftServerMixin from mod spawn,pl:mixin:A} at java.base/java.lang.Thread.run(Thread.java:1583) [?:?] {} A detailed walkthrough of the error, its code path and all known details is as follows: --------------------------------------------------------------------------------------- -- Head -- Thread: Server thread Stacktrace: at MC-BOOTSTRAP/datafixerupper@8.0.16/com.mojang.serialization.DataResult$Error.getOrThrow(DataResult.java:287) ~[datafixerupper-8.0.16.jar#116!/:?] {} at MC-BOOTSTRAP/datafixerupper@8.0.16/com.mojang.serialization.DataResult.getOrThrow(DataResult.java:81) ~[datafixerupper-8.0.16.jar#116!/:?] {} at TRANSFORMER/neoforge@21.1.228/net.neoforged.neoforge.common.util.DataComponentUtil.wrapEncodingExceptions(DataComponentUtil.java:24) ~[neoforge-21.1.228-universal.jar#178!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.item.ItemStack.save(ItemStack.java:403) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:computing_frames,pl:accesstransformer:B,re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B} at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.entity.player.Inventory.save(Inventory.java:384) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.entity.player.Player.addAdditionalSaveData(Player.java:843) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:PlayerMixin from mod spawn,pl:mixin:APP:spawn.mixins.json:accessor.PlayerAccessor from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.level.ServerPlayer.addAdditionalSaveData(ServerPlayer.java:390) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:ServerPlayerMixin from mod spawn,pl:mixin:A} -- Entity being saved -- Details: Entity Type: minecraft:player (net.minecraft.server.level.ServerPlayer) Entity ID: 9 Entity Name: euthymia00 Entity's Exact location: 38.51, 69.56, -349.63 Entity's Block location: World: (38,69,-350), Section: (at 6,5,2 in 2,4,-22; chunk contains blocks 32,-64,-352 to 47,319,-337), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,-64,-512 to 511,319,-1) Entity's Momentum: 0.00, 0.00, 0.00 Entity's Passengers: [] Entity's Vehicle: null Stacktrace: at TRANSFORMER/minecraft@1.21.1/net.minecraft.world.entity.Entity.saveWithoutId(Entity.java:1723) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:EntityMixin from mod spawn,pl:mixin:APP:spawn.mixins.json:accessor.EntityAccessor from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.client.server.IntegratedPlayerList.save(IntegratedPlayerList.java:28) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.players.PlayerList.remove(PlayerList.java:364) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.network.ServerGamePacketListenerImpl.removePlayerFromWorld(ServerGamePacketListenerImpl.java:1215) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.network.ServerGamePacketListenerImpl.onDisconnect(ServerGamePacketListenerImpl.java:1204) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.network.Connection.handleDisconnection(Connection.java:643) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.network.ServerConnectionListener.tick(ServerConnectionListener.java:172) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1051) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:MinecraftServerMixin from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:917) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:MinecraftServerMixin from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.client.server.IntegratedServer.tickServer(IntegratedServer.java:110) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:classloading,pl:runtimedistcleaner:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:707) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:MinecraftServerMixin from mod spawn,pl:mixin:A} at TRANSFORMER/minecraft@1.21.1/net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:267) ~[client-1.21.1-20240808.144430-srg.jar#177!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:spawn.mixins.json:MinecraftServerMixin from mod spawn,pl:mixin:A} at java.base/java.lang.Thread.run(Thread.java:1583) [?:?] {} -- System Details -- Details: Minecraft Version: 1.21.1 Minecraft Version ID: 1.21.1 Operating System: Linux (amd64) version 6.11.11-valve27-1-neptune-611-g60ef8556a811 Java Version: 21.0.3, Microsoft Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft Memory: 3087661984 bytes (2944 MiB) / 4060086272 bytes (3872 MiB) up to 8455716864 bytes (8064 MiB) CPUs: 8 Processor Vendor: AuthenticAMD Processor Name: AMD Custom APU 0932 Identifier: AuthenticAMD Family 23 Model 145 Stepping 0 Microarchitecture: unknown Frequency (GHz): -0.00 Number of physical packages: 1 Number of physical CPUs: 4 Number of logical CPUs: 8 Graphics card #0 name: Sephiroth [AMD Custom GPU 0405] Graphics card #0 vendor: Advanced Micro Devices, Inc. [AMD/ATI] (0x1002) Graphics card #0 VRAM (MiB): 258.00 Graphics card #0 deviceId: 0x1435 Graphics card #0 versionInfo: unknown Virtual memory max (MiB): 15833.26 Virtual memory used (MiB): 10368.26 Swap memory total (MiB): 8428.49 Swap memory used (MiB): 3.50 Space in storage for jna.tmpdir (MiB): Space in storage for org.lwjgl.system.SharedLibraryExtractPath (MiB): Space in storage for io.netty.native.workdir (MiB): Space in storage for java.io.tmpdir (MiB): available: 1467.44, total: 1480.95 Space in storage for workdir (MiB): available: 88954.77, total: 474512.56 JVM Flags: 2 total; -Xms3872m -Xmx8064m Server Running: true Player Count: 1 / 8; [ServerPlayer['euthymia00'/9, l='ServerLevel[New World]', x=38.51, y=69.56, z=-349.63]] Active Data Packs: vanilla, mod_data, mod/spawn (incompatible), mod/neoforge Available Data Packs: bundle, trade_rebalance, vanilla, mod/neoforge, mod/spawn (incompatible), mod_data Enabled Feature Flags: minecraft:vanilla World Generation: Stable World Seed: 7560512385393473592 Type: Integrated Server (map_client.txt) Is Modded: Definitely; Client brand changed to 'neoforge'; Server brand changed to 'neoforge' Launched Version: 1.21.1 ModLauncher: 11.0.5 main.901c6ea8 ModLauncher launch target: forgeclient ModLauncher services: sponge-mixin-0.15.2 mixin.0.8.7.jar mixin PLUGINSERVICE loader-4.0.42.jar slf4jfixer PLUGINSERVICE loader-4.0.42.jar runtime_enum_extender PLUGINSERVICE at-modlauncher-10.0.1.jar accesstransformer PLUGINSERVICE loader-4.0.42.jar runtimedistcleaner PLUGINSERVICE modlauncher-11.0.5.jar mixin TRANSFORMATIONSERVICE modlauncher-11.0.5.jar fml TRANSFORMATIONSERVICE FML Language Providers: javafml@4.0 lowcodefml@4.0 minecraft@4.0 Mod List: client-1.21.1-20240808.144430-srg.jar |Minecraft |minecraft |1.21.1 |Manifest: ****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:****:**** neoforge-21.1.228-universal.jar |NeoForge |neoforge |21.1.228 |Manifest: NOSIGNATURE spawn-4.0.4-1.21.1.jar |Spawn |spawn |4.0.4-1.21.1 |Manifest: NOSIGNATURE Crash Report UUID: 69fa4f00-f1c8-42fc-9305-d01442dadb92 FML: 4.0.42 NeoForge: 21.1.228