Game Crashing at Dunwall Whiskey Distillery

I was replaying Dishonored 1 and I was trying to complete the Granny Rags side mission on the first mission, but when I try to enter Duwall Whiskey Distillery it crashes every time so far it has crashed five times, and I have entered this area before I even accepted the side mission and it was fine but now for some reason it isn't. Can someone explain what's going on?