Map not loading after first marker is published

Hi there,

I’m using the Open User Map plugin with the OpenStreetMap style. Everything works fine as long as no markers are published – the map loads and displays correctly.

However, as soon as I publish the first marker, the map no longer loads. Instead, I just see a loading spinner.

In the browser console, the following error appears:

Uncaught ReferenceError: oum_max_image_filesize is not defined at OUMConfig (frontend-block-map.js:284)

I’ve tried clearing the cache, disabling a view other plugins like WP Rocket, and even reinstalling Open User Map – but the issue persists.

Do you have any idea what might be causing this?

Thanks in advance!
Best regards,

Anja

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