Thank you for vdirsyncer

Syncing from google to nextcloud
The starts and seems to work but eventually creates an error:
Unknown error occurred for {redacted}: Cannot connect to host {redacted}:443 ssl:default [Connect call failed ({redacted}, 443)]

In nextcloud logs, a more descriptive error is displayed:
voku\helper\UTF8::reduce_string_array(): Implicitly marking parameter $remove_short_values as nullable is deprecated, the explicit nullable type must be used instead at /config/www/nextcloud/apps/mail/vendor/voku/portable-utf8/src/voku/helper/UTF8.php#13827

Any workaround?
Thank you