Sorry to hear you're having issues - I just gave that section a look and a few test runs and was unable to replicate the issue myself. If you could give me some more details on exactly when it happens that might help? (I'm assuming you're running it on a Windows PC)
Or - if you're willing to hop in the Discord and message me there I can be more thorough.
Worst Case - You can use the "Jump Start" function in the New Game Preferences area to jump to the start of Chapter 1, since the cliffside conversation is the last thing that happens in the Prologue. It IS an important conversation, but skipping it will at least allow you to continue without messing around with bugfixing.