Every night influxdb crashed with status=2/INVALIDARGUMENT

Hello,

every night once or twice the influxdb crashed with following errors. Any idea what is the problem here? What does status=2/INVALIDARGUMENT mean? I use influxdb v1.6.2

Sep 13 03:28:52 polwb007 systemd[1]: influxdb.service: main process exited, code=exited, status=2/INVALIDARGUMENT
Sep 13 03:28:52 polwb007 systemd[1]: Unit influxdb.service entered failed state.
Sep 13 03:28:52 polwb007 systemd[1]: influxdb.service failed.
Sep 13 03:28:53 polwb007 systemd[1]: influxdb.service holdoff time over, scheduling restart.
Sep 13 03:28:53 polwb007 systemd[1]: Started InfluxDB is an open-source, distributed, time series database.
Sep 13 03:28:53 polwb007 systemd[1]: Starting InfluxDB is an open-source, distributed, time series database…

Thanks,
Suri

There is also this error before influxdb crash and restarted itself

Sep 13 03:28:51 polwb007 influxd[3764]: panic: runtime error: index out of range