Module 'pcntl' already loaded at Unknown#0

Nextcloud version (eg, 20.0.5) : 22.2.3
Operating system and version (eg, Ubuntu 20.04) : 20.04
Apache or nginx version (eg, Apache 2.4.25) : Apache 2.4.41
PHP version (eg, 7.4) : 7.4

Hi,
I set up cron in Nextcloud accordingly what reported in Admnistration Guide * (/5 * * * * php -f /var/www/nextcloud/cron.php) , everything seems to work but, when the job runs (every 5 mins) I get this error in log:

[PHP] Error: Module ‘pcntl’ already loaded at Unknown#0 at 2021-12-17T09:20:02+01:00

Any help, please?

Thanks a lot. Mx.