grecaptcha is not defined

Hi,

on the page of one of my clients, the Google-Recaptcha is not displayed and the following error is shown in the browser console:

“Uncaught ReferenceError: grecaptcha is not defined”

When filling out the registration form, the captcha is not displayed, so it cannot be “filled in”, which of course leads to an error message about the captcha not being filled in.

See:
https://lichttraeumer.de/downloads/745asbgobhwf7goknojhefwqi/grecaptcha-not-defined.png
https://lichttraeumer.de/downloads/745asbgobhwf7goknojhefwqi/no-captcha-to-fillout.png

Do you have any ideas how to fix this?

Thy and best,
Martin

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