I just ran into the same issue as Farious. Crashes the editor on startup. No real help in the log file, but could see the GetGameInstance() was the cause of the crash.
Was also during it during the actor initialize.
.h
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = “Structure”)
UPOTLGameInstance* GameInstance;
.cpp
GameInstance = Cast(GetGameInstance()); <= Crash