Error doing job: Unclosed client session

Hi
I am new in HA and installed it according to the guidelines here. So far, everything works fine. However, the /home/homeassistant/.homeassistant/home-assistant.log file gets filled with the entry
ERROR (MainThread) [homeassistant.core] Error doing job: Unclosed client session
This occurs several times every minute.
The entry in /var/log/daemon.log says:
Mar 13 16:57:18 raspberrypi hass[10349]: 2018-03-13 16:57:18 ERROR (MainThread) [homeassistant.core] Error doing job: Unclosed client session
Mar 13 16:57:18 raspberrypi hass[10349]: 2018-03-13 16:57:18 INFO (MainThread) [homeassistant.core] Bus:Handling <Event system_log_event[L]: source=core.py, exception=, timestamp=152095663 8.7022135, level=ERROR, message=Error doing job: Unclosed client session>

Does anyone know, how to get rid of this?

No.

But you are not alone, see github

Thanks

So we focus on the topic there and close it here.

i think it’s a problem with nmap.
This problem comes when i do sudo apt-get install net-tools nmap.