Gnome Shell related JS errors seen in syslog file during investigating system freeze

I'm using Ubuntu 20.04 LTS (upgraded from original install of 18.04.4 LTS) on an HP Eitebook 2560 Intel Core i5

Trying to investigate a system issue where the UI became unresponsive at the lock screen. Finding lots of the following errors in the /var/log/syslog file around the time when it became unresponsive.

May  7 12:31:00 hp-ubuntu gnome-shell[2046]: JS ERROR: TypeError: windowActor is null#012_addWindowEffect@resource:///org/gnome/shell/ui/closeDialog.js:90:28#012vfunc_show@resource:///org/gnome/shell/ui/closeDialog.js:162:14

May  7 12:31:13 hp-ubuntu gnome-shell[2046]: message repeated 13988 times: [ JS ERROR: TypeError: null has no properties#012_onFocusChanged@resource:///org/gnome/shell/ui/closeDialog.js:135:9#012_setTransitionProgress@resource:///org/gnome/shell/ui/unlockDialog.js:715:9#012_init/<@resource:///org/gnome/shell/ui/unlockDialog.js:494:18]

journalctl

cat /etc/systemd/journald.conf

Can turn off logging to journald to get back some use of your machine until locate and fix the bug that is crashing your machine. Original value was to accept thousands per a second, the screen shot is changed to accept 0 per 0 seconds.

FileName='/etc/systemd/journald.conf'


FindLine='#RateLimitIntervalSec='
ReplaceWith='#RateLimitIntervalSec=0s'
sudo sed -i "/$FindLine/c\$ReplaceWith" $FileName

FindLine='#RateLimitBurst='
ReplaceWith='RateLimitBurst=0'
sudo sed -i "/$FindLine/c\$ReplaceWith" $FileName


cat $FileName | grep --color -E "^|$FindLine"