We are sorry to hear you’re having this issue!
It’d be great if you can send us a crash log at firstname.lastname@example.org. That will help us identify what's going wrong.
To get your crash log -- you can follow these instructions: https://help.dayoneapp.com/en/articles/440759-getting-ios-crash-logs which are for an app called DayOne. In your case, you'll be looking for crash logs that say "Hopscotch" rather than "DayOne".