I'm using Enpass 126.96.36.1997 which is the latest version that works properly for me. Both 188.8.131.521 and 184.108.40.2067 tend to lock up or take a very long amount of time (minutes) when searching and displaying an entry. The UI just locks up and it takes quite some time to come back. All issues are gone once I switched back to 220.127.116.117
I'm running Ubuntu Budgie 19.04 on X11.