UE 4.25.1 Crash on Motion Controller Press

Development Platform & Builds XR Development
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1

I’m using a Windows MR device with SteamVR. Previously this setup was fine under 4.23.1. I’m trying to migrate a project to 4.25.1, but when testing anything with motion controllers, the game crashes as soon as I press any buttons on the controller. Below is the exception:

LoginId:c4db425e4cf48b559dd5b8b9b565a5ae
EpicAccountId:286664bfca284644bce2bea47fe79713

Assertion failed: Key.IsValid() [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/Slate/Private/Framework/Application/SlateApplication.cpp] [Line: 5594]

UE4Editor_Core
UE4Editor_Core
UE4Editor_Slate
UE4Editor_SteamVRInputDevice
UE4Editor_SteamVRInputDevice
UE4Editor_ApplicationCore
UE4Editor_Slate
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll
2

Having the same issue after upgrading to .25, but the crash is instant and I’m using Steam VR/Index controllers and Vive HMD.

3

I think you should check Input from Project Settings. UE 4.25. have update the name of controller input, maybe it cause crash. It work for me, hope it help you.

4

I’m also having the same issue after upgrading to 4.25. I’m using HTC Vive and the application crashes when pressing input on controller.

5

I had the same problem after updating my project to 4.25.4 and managed to fix it by deleting the file “DefaultInput.ini” and then re-adding my action mappings in “Project Settings - Engine - Input”.

Hope this helps.

6

thank you!!! fixed my project