Nextcloud after update not reachable(HTTP ERROR 500)

Dear community,

since my PHP version was outdated (5.x) I had to update to version 7.2. After updating Nextcloud to version 13.x via the automatic updater in the backend, Nextcloud is no longer reachable. When I go to the website only a blank page appears and Chrome reports a “HTTP ERROR 500”. What can I do now?

What information do you need from me?

I would be glad about a quick help. :roll_eyes:

Nextcloud version (eg, 12.0.2): i think it has been updated to 13.??
Operating system and version (eg, Ubuntu 17.04): running on an external Webspace
Apache or nginx version (eg, Apache 2.4.25): latest version
PHP version (eg, 7.1): now 7.2

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N): Y

The output of your Nextcloud log in Admin > Logging:

not reachable

The output of my config.php file:

    $CONFIG = array (
      'instanceid' => 'XXX',
      'passwordsalt' => 'XXX',
      'secret' => 'XXX',
      'trusted_domains' => 
      array (
        0 => '',
      'datadirectory' => '/XXX/XXX/XXX/htdocs/XXX/data',
      'overwrite.cli.url' => '',
      'dbtype' => 'sqlite3',
      'version' => '',
      'dbname' => 'XXX',
      'dbhost' => 'XXX',
      'dbport' => '',
      'dbtableprefix' => 'oc_',
      'dbuser' => 'XXX',
      'dbpassword' => 'XXX',
      'installed' => true,
      'maintenance' => false,
      'updater.secret' => 'XXX,
      'theme' => '',