Something with BlendSpaces crashes my preview/game a few seconds after starting

It was working before and I didnt change anything on the project. No error messages on compile.

If I close the preview fast, it doesnt crash. If I don’t move the character, it doesn’t crash.

If I move, it will crash after a few seconds of moving. Any kind of action will crash it, it’s not a specific movement.

Assertion failed: Context.MarkerTickContext.IsMarkerSyncStartValid() [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/Engine/Private/Animation/BlendSpaceBase.cpp] [Line: 322]

UE4Editor_Core

UE4Editor_Core

UE4Editor_Engine

UE4Editor_Engine UE4Editor_Engine

UE4Editor_Engine

UE4Editor_Engine

UE4Editor_Engine

UE4Editor_Core

UE4Editor_Core

UE4Editor_Core

UE4Editor_Core

UE4Editor_Core

kernel32

ntdll