An error message appears when submitting a form in the frontend.

If an error message appears on the frontend when filling out a form, you may receive an admin notification that the validation of a WordPress NONCE failed.

NONCE is a WordPress security token that is also integrated into GREYD.Forms. NONCEs are used to protect against abuse and malware. If you receive such a notification, it means that something was suspicious and the form was prevented from being submitted. You do not need to do anything.

If you receive NONCE error messages very frequently, you should check the caching settings on your website. With a very long caching, it is possible that users are loading a version of your website that is too "old" and this is triggering the security token.