Focus Item: 500 internal error when clicking on "Builder"

Good day.

Mautic version: 4.4.4
PHP version: 7.4.30
MYSQL version: 10.5.15

Logs: mautic.CRITICAL: Uncaught PHP Exception Symfony\Component\Debug\Exception\FatalThrowableError: “Argument 1 passed to MauticPlugin\MauticFocusBundle\Helper\IframeAvailabilityChecker::check() must be of the type string, null given, called in /var/www/mautic/plugins/MauticFocusBundle/Controller/AjaxController.php on line 24” at /var/www/mautic/plugins/MauticFocusBundle/Helper/IframeAvailabilityChecker.php line 27 {“exception”:“[object] (Symfony\Component\Debug\Exception\FatalThrowableError(code: 0): Argument 1 passed to MauticPlugin\MauticFocusBundle\Helper\IframeAvailabilityChecker::check() must be of the type string, null given, called in /var/www/mautic/plugins/MauticFocusBundle/Controller/AjaxController.php on line 24 at /var/www/mautic/plugins/MauticFocusBundle/Helper/IframeAvailabilityChecker.php:27)”}

I get 500 internal error when I try to create a focus point and I can’t seem to understand what causes it.

It happens with any site I try to add not just ours.

Thank you!

PS Is this related to this?