foris and reforis log error to /var/log/messages on almost every pageview in TOS 5.1

starting with Turris 5.1 on my Turris Omnia, on almost every page view in both Foris and reForis, the following lines are put in /var/log/messages

Aug 28 04:28:11 turris foris-controller[14430]: ERROR:foris_controller_backends.files:Failed to parse content of the file '/proc/cmdline'

Aug 28 04:28:11 turris foris-controller[14430]: ERROR:foris_controller_backends.files:Failed to parse content of the file '/proc/cmdline'

Aug 28 04:28:11 turris foris-controller[14430]: ERROR:foris_controller_backends.files:Failed to parse content of the file '/proc/cmdline'

Aug 28 04:28:11 turris foris-controller[14430]: ERROR:foris_controller_backends.files:Failed to parse content of the file '/proc/cmdline'

Content of /proc/cmdline on my router is:

earlyprintk console=ttyS0,115200 rootfstype=btrfs rootdelay=2 root=b301 rootflags=subvol=@,commit=5 rw cfg80211.freg=**

Edited by Tony Quan