I think I know what this is, use the "quit" option at the computer.
If this does not work tell me, I can port a savefile with your progress and see if that works, or port a build at the point you should have been.
Thing is the options at the computer loops back to the start, if continue on like you would a conversation the options should appear again, one of them is "quit".
I tried to emulate your problem and I think just pressing space and then choosing quit at the computer should solve it.
If you for any reason just cant be bothered and still want to know what happens I have a full playthroughvideo here:
