bal2-hmg9-l3 hourly traffic in percent of capacity 2021-11-22

/data/traffic/plot/plot-hr -n bal2-hmg9-l3 -d 2021-11-22 -t traffic -f png  >/data/traffic/html/imgs/hr.traffic.bal2-hmg9-l3.2021-11-22.png
Illegal division by zero at /data/traffic/plot/plot-hr line 97.
Plot failed, ret = 255