it crashes in 0.30 if you saved in 0.29 both during the dialogue with him and during the placeholder screen saying that is all for the current version? Also make sure it is the latest 0.30, maybe caro fixed it.
Oh, is it a proper crash? Most times, Renpy shows you a gray screen saying "an exception has occurred" with all the info, often offers you to rollback or ignore the error, send a screenshot of that if possible... otherwise, i think it generates a file like "log" or even "log crash" in your folder, that could be useful to see too.