Blank screen on dashboard

Hi,
I receive a blank screen with this error when going on the dashboard: " There has been a critical error on this website."

Cerber was working fine before. I just became aware of the Cloudflare add-on and I installed it since the site is behind Cloudflare. On the Add-on page I turned the features at the bottom of the page like logging, but I didn’t turn the Cloudflare add-on on. When I saved I received an error also on the add-on page. So I deactivated and removed the add-on.

But now I have the error on the Dashboard.

I have this line in my error.log:
PHP Fatal error: Uncaught Error: Object of class _PHP_Incomplete_Class could not be converted to string in /var/www/html/wp-content/plugins/wp-cerber/cerber-common.php:698\nStack trace:\n#0 /var/www/html/wp-content/plugins/wp-cerber/cerber-common.php(698): implode(‘,’, Array)\n#1 /var/www/html/wp-content/plugins/wp-cerber/cerber-common.php(766): {closure}()\n#2 /var/www/html/wp-content/plugins/wp-cerber/admin/cerber-dashboard.php(163): cerber_issue_monitor()\n#3 /var/www/html/wp-content/plugins/wp-cerber/admin/cerber-dashboard.php(5918): cerber_show_admin_page(‘Traffic Inspect…’, Array, ‘traffic’, Object(Closure))\n#4 /var/www/html/wp-includes/class-wp-hook.php(324): cerber_render_admin_page(‘cerber-traffic’)\n#5 /var/www/html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(‘’, Array)\n#6 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)\n#7 /var/www/html/wp-admin/admin.php(259): do_action('wp-cerber_page…‘)\n#8 /var/www/html/wp-admin/network/admin.php(13): require_once(’/var/www/html/w…')\n#9 {main}\n thrown in /var/www/html/wp-content/plugins/wp-cerber/cerber-common.php on line 698

I tried deactivating and reactivitaing Cerber, but it’s not helping.
Anything I could do?

Thank you

After deleting Cerber using cli, and resintalling, the main dashboard started working again. I was able to setup the options as needed.

But after 10-15 mn the dashboard started crashing again, with the same error in the logs. Very strange. Not sure what to do next?