Multiplayer 1.21 crashing on startup

[joshua hurlock]

My mate and I are trying to run up a new server hosted on his end. Confirmed I was able to join the server but as soon as the game finished loading it crashes. Any help would be greatly appreciated. We have restarted the server. Cheers. 

 

Running on 64 bit Windows 10.0.19045.0 with 16309 MB RAM
Game Version: v1.21.0 (Stable)
26/08/2025 8:21:10 PM: Critical error occurred
Loaded Mods: game@1.21.0, creative@1.21.0, survival@1.21.0
System.NullReferenceException: Object reference not set to an instance of an object.
   at Vintagestory.API.Common.Entities.Entity.<>c__DisplayClass139_0.<Initialize>b__1() in VintagestoryApi\Common\Entity\Entity.cs:line 612
   at Vintagestory.API.Datastructures.SyncedTreeAttribute.FromBytes(BinaryReader stream) in VintagestoryApi\Datastructures\AttributeTree\Other\SyncedTreeAttribute.cs:line 236
   at Vintagestory.API.Common.Entities.Entity.FromBytes(BinaryReader reader, Boolean isSync) in VintagestoryApi\Common\Entity\Entity.cs:line 1910
   at Vintagestory.API.Common.EntityAgent.FromBytes(BinaryReader reader, Boolean forClient) in VintagestoryApi\Common\Entity\EntityAgent.cs:line 791
   at Vintagestory.Client.NoObf.ClientSystemEntities.updateEntityFromPacket(Packet_Entity entitypacket, Entity entity) in VintagestoryLib\Client\Systems\Entities.cs:line 426
   at Vintagestory.Client.NoObf.ClientSystemEntities.createOrUpdateEntityFromPacket(Packet_Entity entitypacket, ClientMain game, Boolean addToLoadQueue) in VintagestoryLib\Client\Systems\Entities.cs:line 417
   at Vintagestory.Client.NoObf.ClientSystemEntities.<>c__DisplayClass8_0.<HandleEntityLoadedPacket>b__0() in VintagestoryLib\Client\Systems\Entities.cs:line 222
   at Vintagestory.Client.NoObf.ClientMain.ExecuteMainThreadTasks(Single deltaTime) in VintagestoryLib\Client\ClientMain.cs:line 779
   at Vintagestory.Client.NoObf.ClientMain.MainGameLoop(Single deltaTime) in VintagestoryLib\Client\ClientMain.cs:line 745
   at Vintagestory.Client.GuiScreenRunningGame.RenderToPrimary(Single dt) in VintagestoryLib\Client\MainMenu\Screens\GuiScreenRunningGame.cs:line 172
   at Vintagestory.Client.ScreenManager.Render(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 719
   at Vintagestory.Client.ScreenManager.OnNewFrame(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 663
   at Vintagestory.Client.NoObf.ClientPlatformWindows.window_RenderFrame(FrameEventArgs e) in VintagestoryLib\Client\ClientPlatform\GameWindow.cs:line 113
   at OpenTK.Windowing.Desktop.GameWindow.Run()
   at Vintagestory.Client.ClientProgram.Start(ClientProgramArgs args, String[] rawArgs) in VintagestoryLib\Client\ClientProgram.cs:line 338
   at Vintagestory.Client.ClientProgram.<>c__DisplayClass10_0.<.ctor>b__1() in VintagestoryLib\Client\ClientProgram.cs:line 133
   at Vintagestory.ClientNative.CrashReporter.Start(ThreadStart start) in VintagestoryLib\Client\ClientPlatform\ClientNative\CrashReporter.cs:line 95

Event Log entries for Vintagestory.exe, the latest 1
==================================
{ TimeGenerated = 26/08/2025 8:17:49 PM, Site = , Source = Application Error, Message = Faulting application name: Vintagestory.exe, version: 1.21.0.0, time stamp: 0x68760000
Faulting module name: openal32.dll, version: 1.23.0.0, time stamp: 0x63dd31ad
Exception code: 0x40000015
Fault offset: 0x00000000000df046
Faulting process id: 0x70d0
Faulting application start time: 0x01dc16716eb28acd
Faulting application path: C:\Users\Josh\AppData\Roaming\Vintagestory\Vintagestory.exe
Faulting module path: C:\Users\Josh\AppData\Roaming\Vintagestory\Lib\openal32.dll
Report Id: 0a063135-b621-434d-b932-987998272993
Faulting package full name: 
Faulting package-relative application ID:  }

[joshua hurlock]

Sorry forgot to advise no mods in server. 

[joshua hurlock]

Another update, we have down graded to 1.20.12 and we are getting the same error message. 

[Char44]

I've had the same issue with updating my game to 1.21.1 and it's refusing to load any data if with me being the host. Only solution I've found is downgrading to 1.20.12 and restarting the server. Are you using a client server or your own?