So I added hestiaweb and the error is gone. As I checked, this entry was added by v-add-letsencrypt-domain at line 583 and it does not contain a username. However I’m not sure if this is neccesery cause the install script add the same job to hestiaweb users crontab.
The user exists and the problem solved on my side. I just want to point out, that there is an error in v-add-letsencrypt-domain command, that the line added to /etc/cron.d/hestiaweb is missing a username.
# Adding LE autorenew cronjob
if [ -z "$(grep v-update-letsen "/etc/cron.d/hestiaweb")" ]; then
min=$(generate_password '012345' '2')
hour=$(generate_password '1234567' '1')
echo "$min $hour * * * sudo /usr/local/hestia/bin/v-update-letsencrypt-ssl" > /etc/cron.d/hestiaweb
fi