Engine crash when changing Swados Scalability

Hey there, I have been having this problem for quite a while but now I have got to fix it. Basically on this one map only, setting scalability settings for shadows only to something above Low will crash the engine. In this 5.1 project I had Lumen enabled but then disabled it down the line for performance issues. Also the crash occurs both in VR and not. Thanks in advance. Cheers.