2020-03-12 16:06:02,651 ERROR    run_plot_tsstats cannot write timeseries stats for daily report
Traceback (most recent call last):
  File "/usr/local/currents/bin/run_plot_tsstats.py", line 109, in <module>
    sstr = stats_str(sd)
  File "/usr/local/lib/python3.6/dist-packages/pycurrents/adcp/tseries_diffstats.py", line 153, in stats_str
    s.append('pings per ensemble        :  %4d       %4d  ' % (sd.Sn.mean,  sd.Sn.std))
ValueError: cannot convert float NaN to integer