Sounds like one of those rare and usually unique moments the engine just wants to say goodbye. Have you tried to do it again? If it happens again, what does the error message say?
The way how you received Chiyo's new skill was bugged in the first upload. I made a new upload a day after the release with a fix, so that you properly get Chiyo's skill when you talk with her in the sleeping chambers. If you're on windows, you can use the "update files" to apply the fix.