My client noticed the problem on this form: https://www.giteau.fr/contact/
I fixed the issue following this Stack Overflow thread: https://stackoverflow.com/questions/78101215/contact-form-undefined-value-was-submitted-through-this-field
Yesterday morning, my client received a submission from that page. Then the plugin updated, and after that, no one could submit the form anymore.
The error message appeared in the first two fields (checkboxes and radio).
