Event + Contribution + Payment registration Webform fails

I have developped Webforms to enable users to register (themselves + their childres) to an event and pay on line their associated Contribution, then being sent to an other Drupal page. This used to work perfectly until the new stripe extension release.

But now, both the Event registration, and the Payment fail : the user is directly redirected to the site home page, without any message.

Drupal 7.67 / Civi 5.16.2