I am also getting a very regular crash - usually when it is syncing with Gdrive
A snippet of the crash log is
Process: Enpass [1177]
Path: /Applications/Enpass.app/Contents/MacOS/Enpass
Identifier: in.sinew.Enpass-Desktop
Version: 5.6.0 (112)
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Enpass [1177]
Date/Time: 2017-11-25 10:34:59.168 +0000
OS Version: Mac OS X 10.11.6 (15G1108)
Report Version: 11
Time Awake Since Boot: 57000 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: EXC_I386_GPFLT
Exception Note: EXC_CORPSE_NOTIFY
Global Trace Buffer (reverse chronological seconds):
5.761089 CFNetwork 0x00007fff886a9db3 TCP Conn 0x7f8c8e445dc0 SSL Handshake DONE
6.146605 CFNetwork 0x00007fff886a9c8f TCP Conn 0x7f8c8e445dc0 starting SSL negotiation
6.146908 CFNetwork 0x00007fff886a8659 TCP Conn 0x7f8c8e445dc0 complete. fd: 42, err: 0
6.147108 CFNetwork 0x00007fff88736f33 TCP Conn 0x7f8c8e445dc0 event 1. err: 0
6.254411 CFNetwork 0x00007fff886a792b TCP Conn 0x7f8c8e445dc0 started
6.301972 CFNetwork 0x00007fff8866b56e Creating default cookie storage with process/bundle identifier
6.301972 CFNetwork 0x00007fff8866b506 Faulting in CFHTTPCookieStorage singleton
6.301972 CFNetwork 0x00007fff8866b395 Faulting in NSHTTPCookieStorage singleton