It's because your suppose to go to the bridge first. It happened to me as well.
oh that's strange. Probably a bug. Or maybe your pc? I only crashed when I went to the building first by accident. Check your task manager. You can find it by right clicking the windows icon and then select task manager. This will show how much power usage each app is using only when opened. If it shows the game with a very high usage, that's not good. It means your pc is not as strong. If that's not the case, maybe check if your pc is dusty.