Javascript not loading only when logged out from Wordpress

Question

I'm inserting this script into my wordpress site using Elementor:

<script src="https://www.fourvenues.com/assets/iframe/"></script>

It looks great while I'm logged-in but as soon as I log-out I got this error on the console:

Uncaught TypeError: Cannot read properties of null (reading 'style')
    at createIframe (events:45:11)
    at script.onload (events:36:7)

I thought it might be some DOM content not loaded but used a DOMContentLoaded script but no results.

You can see it in action here