RB4 instrument mapper closes or throws an "unhandled error has ocurred" window

[CobaldTrix]

one day just stopped working. after pressing the start button on the app the system throw window after window of a message that says:
"An unhandled error has ocurred:
System.ArgumentNullException: The value cannot be null.

A log of the error has been created, do you want to open it?"

This is that logs content:

[2025/10/17 10:39:11] GameInput device 00-A6-D8-CB-ED-90-3A-D0-87-86-CA-04-53-BA-D9-F1-8E-84-F4-EB-85-9B-9B-0B-33-5B-F0-40-B3-5E-E2-B5 connected
[2025/10/17 10:39:11] Created new ViGEmBus device with user index 0
[2025/10/17 10:39:11] Created new GuitarRPCS3Mapper
[2025/10/17 10:39:53] -------------------
[2025/10/17 10:39:53] UNHANDLED EXCEPTION
[2025/10/17 10:39:53] -------------------
[2025/10/17 10:39:53] EXCEPTION

Unhandled exception!
System.ArgumentNullException: El valor no puede ser nulo.
Nombre del parámetro: buffer
en SharpGameInput.LightIGameInputRawDeviceReport.GetRawData(UIntPtr bufferSize, Void* buffer) en E:\Programming\Source\repos\SharpGameInput\source\Interfaces.Generated.cs:línea 3132
en RB4InstrumentMapper.Parsing.GameInputBackendDevice.HandleReading(LightIGameInputReading reading, DeviceMapper mapper) en E:\Programming\Source\repos\RB4InstrumentMapper\Program\PacketParsing\Backends\GameInputBackendDevice.cs:línea 156
en RB4InstrumentMapper.Parsing.GameInputBackendDevice.<>c__DisplayClass22_0.b__0(LightGameInputCallbackToken token, Object context, LightIGameInputReading reading, Boolean hasOverrunOccurred) en E:\Programming\Source\repos\RB4InstrumentMapper\Program\PacketParsing\Backends\GameInputBackendDevice.cs:línea 96
en SharpGameInput.IGameInput.<>c__DisplayClass5_0.b__0(UInt64 _token, Void* _, IntPtr _reading, Boolean hasOverrunOccurred) en E:\Programming\Source\repos\SharpGameInput\source\IGameInput.Callbacks.cs:línea 79
--- Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción ---
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
en System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
en System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
en System.Threading.ThreadPoolWorkQueue.Dispatch()

[2025/10/17 10:39:58] -------------------
[2025/10/17 10:39:58] UNHANDLED EXCEPTION
[2025/10/17 10:39:58] -------------------
[2025/10/17 10:39:58] EXCEPTION

Unhandled exception!
System.ArgumentNullException: El valor no puede ser nulo.
Nombre del parámetro: buffer
en SharpGameInput.LightIGameInputRawDeviceReport.GetRawData(UIntPtr bufferSize, Void* buffer) en E:\Programming\Source\repos\SharpGameInput\source\Interfaces.Generated.cs:línea 3132
en RB4InstrumentMapper.Parsing.GameInputBackendDevice.HandleReading(LightIGameInputReading reading, DeviceMapper mapper) en E:\Programming\Source\repos\RB4InstrumentMapper\Program\PacketParsing\Backends\GameInputBackendDevice.cs:línea 156
en RB4InstrumentMapper.Parsing.GameInputBackendDevice.<>c__DisplayClass22_0.b__0(LightGameInputCallbackToken token, Object context, LightIGameInputReading reading, Boolean hasOverrunOccurred) en E:\Programming\Source\repos\RB4InstrumentMapper\Program\PacketParsing\Backends\GameInputBackendDevice.cs:línea 96
en SharpGameInput.IGameInput.<>c__DisplayClass5_0.b__0(UInt64 _token, Void* _, IntPtr _reading, Boolean hasOverrunOccurred) en E:\Programming\Source\repos\SharpGameInput\source\IGameInput.Callbacks.cs:línea 79
--- Fin del seguimiento de la pila de la ubicación anterior donde se produjo la excepción ---
en System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
en System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
en System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
en System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
en System.Threading.ThreadPoolWorkQueue.Dispatch()

[CobaldTrix]

this log is for the 5.0.5.0 release but it also happens on the latest release

[dricci21]

I also got this issue but solved it using a fix from a few months ago.

I fixed it by going to windows settings -> Add or remove programs -> then typing "Microsoft Game Input" into the search bar then uninstalling it.

Note: Windows will reinstall it every time you turn off your computer so you need to delete it again.

If you are not on windows I don't have an answer for you and I'm sorry.

[Tom3kk]

I also got this issue but solved it using a fix from a few months ago.

I fixed it by going to windows settings -> Add or remove programs -> then typing "Microsoft Game Input" into the search bar then uninstalling it.

Note: Windows will reinstall it every time you turn off your computer so you need to delete it again.

If you are not on windows I don't have an answer for you and I'm sorry.

Thanks! I reinstalled vigembus and rb4mapper and it kept happening, almost lost hope and found your solution!
Maybe rename the issue to "Application crashes when Microsoft GameInput is installed"

[luxas789]

Having this issue still despite uninstalling Microsoft Game Input, it's no longer present and I'm still getting the explosion of error windows before crash with both ViGEmBus and Vjoy. Seeking help on the reddit as well but not sure where to go from here.