Updating from to

Using atomatic updater from my Nextcloud site, the update was not going to end. Now i got ‘Update in process’ for a while.
Here php version :PHP 7.3.8-1+0~20190807.43+debian8~1.gbp7731bf (cli) (built: Aug 7 2019 21:10:02) ( NTS ).
Unfortunatly i don’t have a recent backup(one year old). But all the files are on several clients (desktop).
occ could be sefull in this case ?
In /var/log/apache2/nextcloud/error.log :
[Fri Jun 19 17:42:56.776420 2020] [ssl:emerg] [pid 25402] SSL Library Error: error:140A80B1:SSL routines:SSL_CTX_check_private_key:no certificate assigned
[Mon Jun 22 15:35:03.940470 2020] [php7:error] [pid 2510] [client] script ‘/var/www/html/nextcloud/phpinfo.php’ not found or unable to stat.
in /var/log/apache2/error.log nothing can help us about this update aborted?

Thanks for your help.

About security certificate. Resolved.

Can you run the upgrade from there?
sudo -u www-data php occ upgrade