detail mode on remote host crashes ntpmon

(remote host is runnning ntpd 4.2.8p7@1.3265-o Wed May 11 03:27:53 UTC 2016)

$ ntpmon  192.168.1.3

(then press 'd')

Traceback (most recent call last):
  File "/usr/local/bin/ntpmon", line 221, in <module>
    stdscr.addstr(peer_detail(retained))
  File "/usr/local/bin/ntpmon", line 70, in peer_detail
    vcopy['xmt'] = ntp.util.rfc3339(ntp.ntpc.lfptofloat(vcopy['xmt']))
KeyError: 'xmt'

best regards Dave