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:
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.
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”.