Contact Form PHP Error

Project Brief: Contact Form PHP Error
Overview:
We are experiencing an issue with the contact form on our website. When users attempt to submit the form, an error appears, and the form does not process or send the data as expected.
Details:
• The form is built using PHP (likely includes HTML and possibly JavaScript validation).
• The error occurs immediately upon clicking the "Submit" button.
• The specific error message is not user-friendly or is not displayed properly (please check and log any PHP errors).
• The form is supposed to send an email with the submitted details or save data to the database.
BUT SHOWING
Error: {"next":"/thanks?language=sv","ok":true}

Request:
We need a PHP developer to:
1. Review the form code and identify the cause of the error.
2. Fix the error so that the form submits correctly.
3. Ensure basic security measures are in place (e.g., input sanitization, spam protection).
4. Optionally, improve the user feedback after form submission (success/failure message).
Access:
Please let us know what access or files you need to begin