Unknown variable. Trying one at a time.

Should we be worried about this ?

Sounds like an error. ( First line of output )

# ntpq -c sysinfo 
Unknown variable.  Trying one at a time.
associd=0 status=0615 leap_none, sync_ntp, 1 event, clock_sync,
system peer:        pi3:123
system peer mode:   client
leap indicator:     00
stratum:            2
log2 precision:     -18
root delay:         0.448
root dispersion:    10.742
reference ID:       192.168.241.91
reference time:     dd655e32.4c595ddc 2017-09-14T19:59:46.298Z
system jitter:      0.163427
clock jitter:       0.024365
clock wander:       0.004364
broadcast delay:    ?
symm. auth. delay:  0.0

# ntpq -c vers 
ntpsec-0.9.7+1329 2017-09-14T08:50:55-0400

Kind regards
Hans