Error 500 after pressing Next button, when using Total field in form

  • I set up a multi-step form for a credit calculator, and the calculations are performed correctly.

    However, when I press the Next button, I get the following error message

    There was an error. Please try again later.
    There has been a critical error on this website.

    Learn more about WordPress diagnostics.

    Checking the console, I see that the error is being generated by the /wp-admin/admin-ajax.php file. Attached screenshot.

    On reviewing more details of the error it is due to a strict-origin-when-cross-origin policy. Attached screenshot.

    The curious thing is that I do not use fields of type Total Field or I do not add the calculations, this error is not shown and allows me to finish the process until I receive the email with the customer data.

    The domain is temporary, because the site is under development, so we need to fix this error that is shown when adding formulas in the Total field, to migrate it to the final domain.

    The page I need help with: [log in to see the link]

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