I recently updated to macOS 10.13.2 and Safari 11.0.2, but nothing changed. I still get the connection error.
@Dirk Kolbe I guess like myself you are from Germany, use German keyboard layout and "," as decimal separator?
@Akash Vyas Maybe this could be a hint why you can't reproduce it? Also, the German "Umlaute" (ä, ö, ü) often are the cause for strange software problems. I think have used some in the content of the Enpass database, but not in folder paths or user name of my system.