Vintage Story version
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Vintage Story Mod DB · Vintage Story mod
SendPlayerMountPositionPacketFix
Fixes the following error that cause client crashes usually when you log in while being mounted on an elk. This harmony patch just ignores the exception. System.ArgumentException: Mount Position is not a number at Vintagestory.Client.NoObf.NetworkAPI.SendPlay
Choose a version Pick your version below, then grab the matching file.
Quick answer
Which SendPlayerMountPositionPacketFix release should I use?
Latest stable file 1.1.0
Game version 1.20.12
Loader Built-in Vintage Story mod system
SendPlayerMountPositionPacketFix 1.1.0 targets 1.20.12. It must be installed on the client. Installation on the dedicated server is optional. No extra mods listed for this file.
Where it goes
Is SendPlayerMountPositionPacketFix required on the client, server, or both?
It must be installed on the client. Installation on the dedicated server is optional.
Client Required
Dedicated server Optional
Loader for this release Built-in Vintage Story mod system
Required install it here Optional supported, not mandatory Not supported do not install here Source doesn’t say do not assume
This release supports both sides, but the source does not require it on the server.
What else does SendPlayerMountPositionPacketFix 1.1.0 need?
1.1.0. Change the file and its required mods may change too.
This file does not list any required mods. Do not add a library just because a different file uses it.
This file does not list any required or optional mods.
Before you install it
Add SendPlayerMountPositionPacketFix without breaking your instance.
Built for SendPlayerMountPositionPacketFix 1.1.0. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use 1.1.0. It targets 1.20.12; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
This file does not list any required mods. Do not add a library just because a different file uses it.
- 03
Put it on the correct side
It must be installed on the client. Installation on the dedicated server is optional.
- 04
Pick the file you checked
Use the “Get this file” button beside 1.1.0. It opens that exact file at the source.
About this project
What does SendPlayerMountPositionPacketFix add?
Fixes the following error that cause client crashes usually when you log in while being mounted on an elk. This harmony patch just ignores the exception.
System.ArgumentException: Mount Position is not a number at Vintagestory.Client.NoObf.NetworkAPI.SendPlayerMountPositionPacket(Entity mount) in VintagestoryLib\Client\API\NetworkAPI.cs:line 271 at Vintagestory.GameContent.EntityBehaviorPlayerPhysics.OnRenderFrame(Single dt, EnumRenderStage stage) in VSEssentials\Entity\Behavior\BehaviorPlayerPhysics.cs:line 398 at Vintagestory.Client.NoObf.ClientEventManager.TriggerRenderStage(EnumRenderStage stage, Single dt) in VintagestoryLib\Client\Util\ClientEventManager.cs:line 202 at Vintagestory.Client.NoObf.ClientMain.TriggerRenderStage(EnumRenderStage stage, Single dt) in VintagestoryLib\Client\ClientMain.cs:line 816 at Vintagestory.Client.NoObf.ClientMain.MainRenderLoop(Single dt) in VintagestoryLib\Client\ClientMain.cs:line 868 at Vintagestory.Client.NoObf.ClientMain.MainGameLoop(Single deltaTime) in VintagestoryLib\Client\ClientMain.cs:line 740 at Vintagestory.Client.GuiScreenRunningGame.RenderToPrimary(Single dt) in VintagestoryLib\Client\MainMenu\Screens\GuiScreenRunningGame.cs:line 170 at Vintagestory.Client.ScreenManager.Render(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 695 at Vintagestory.Client.ScreenManager.OnNewFrame(Single dt) in VintagestoryLib\Client\ScreenManager.cs:line 670 at Vintagestory.Client.NoObf.ClientPlatformWindows.window_RenderFrame(FrameEventArgs e) in VintagestoryLib\Client\ClientPlatform\GameWindow.cs:line 88 at OpenTK.Windowing.Desktop.GameWindow.Run()
Only relevant for VS 1.20.12 and most likely fixed in 1.21
Project description from Vintage Story Mod DB.
Pick your setup
SendPlayerMountPositionPacketFix releases for each Vintage Story version.
Choose the version and loader you play, then open the matching release.
Check the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
SendPlayerMountPositionPacketFix versions and loaders
1.1.0
sendplayermountpositionpacketfix_1.1.0.zip
29 Sept 2025
Client Required Server Optional Dependencies No extras listed Listed on Release listing
Check the 1.20.12 setup 1.20.12 release
1.0.0
sendplayermountpositionpacketfix_1.0.0.zip
29 Sept 2025
Client Source doesn’t say Server Source doesn’t say Dependencies No extras listed Listed on Release listing
Check the 1.20.12 setup 1.20.12 release
Looking for an older file? The official Vintage Story Mod DB project page is in Resources.
