Occ upgrade error: Table 'nextcloud.oc_groups' doesn't exist

Hi,

I am trying to upgrade my NC installation from v17 to v18.

I use the FreeBSD package manager to upgrade from 17.0.7 to 18.0.4

I run this command:
$ sudo -u www php occ upgrade

This error is displayed:

Doctrine\DBAL\Exception\TableNotFoundException: An exception occurred while executing 'ALTER TABLE oc_groups ADD displayname VARCHAR(255) DEFAULT '' NOT NULL':`

SQLSTATE[42S02]: Base table or view not found: 1146 Table 'nextcloud.oc_groups' doesn't exist
    Update failed
    Maintenance mode is kept active
    Reset log level

What is going wrong here? Thanks in advance

Nextcloud v17.0.7
FreeBSD 12.1-RELEASE-p5
apache v2.4.43
PHP v7.3.17

`$ sudo cat config/config.php
<?php
$CONFIG = array (
  'instanceid' => '516ae6f15e855',
  'passwordsalt' => 'xxx',
  'datadirectory' => '/mnt/disk10/data',
  'dbtype' => 'mysql',
  'version' => '17.0.7.1',
  'dbname' => 'nextcloud',
  'dbhost' => '127.0.0.1',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'xxx',
  'dbpassword' => 'xxx',
  'installed' => true,
  'maintenance' => false,
  'theme' => '',
  'forcessl' => true,
  'default_locale' => 'en-dk',
  'force_language' => 'en_DK',
  'force_locale' => 'en_DK',
  'trusted_domains' => 
  array (
    0 => 'xxx',
  ),
  'mail_from_address' => 'root',
  'mail_smtpmode' => 'smtp',
  'mail_smtphost' => '127.0.0.1',
  'mail_smtpport' => 10026,
  'mail_domain' => 'xxx.nl',
  'secret' => 'xxx',
  'log_type' => 'file',
  'logfile' => '/var/log/nextcloud.log',
  'logtimezone' => 'Europe/Amsterdam',
  'logfilemode' => 416,
  'loglevel' => 'debug',
  'logdateformat' => 'Y F d-H:i:s',
  'trashbin_retention_obligation' => '180, auto',
  'overwrite.cli.url' => '/nextcloud',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'overwritewebroot' => '/nextcloud',
  'apps_paths' => 
  array (
    0 => 
    array (
      'path' => '/usr/local/www/nextcloud/apps',
      'url' => '/apps',
      'writable' => true,
    ),
    1 => 
    array (
      'path' => '/usr/local/www/nextcloud/apps-pkg',
      'url' => '/apps-pkg',
      'writable' => false,
    ),
  ),
  'app_install_overwrite' => 
  array (
    0 => 'calendar',
    1 => 'tasks',
  ),
  'updater.secret' => 'xxx',
);
`