Hi,
on the site bastiaintv.com, currently hidden to navigation for update purpouses, I see the error which I indicated above "Uncaught SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data" when I submit the contact form on the following page: https://www.bastiaintv.com/en/contact-us. It is very strange, since the same form works fine inside the other contact pages for the other languages, and that pages contain exactly the same widget and components. What it is certain is that the problem depends on your javascript as you can notice in the screenshot below:

Can you please help us resolve the bug?
I send you the credentials to the backend, which you can use also to see the frontend, since as I mentioned above is currently hidden to navigation.
Thanks in advance for the support.
Best regards.