Hey!
I think I've run into this exact bug myself and have been meaning to put out a patch that fixes it... I believe to fix it, go to the inspector for your story, and click the "Gather all Nodes" button. Let me know if that works! If not, check the list of passages and see if one of them is blank. (I also have to fix a bug related to that)
Sorry about that! I've been a bit swamped with contract work, but really want to push a proper fix for this...