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"Cannot set property 'innerHTML' of null"

Hi!

Hope to get some help with this error in the attached images.
“Cannot set property ‘innerHTML’ of null” on line 386.

The navigation doesn’t work. I’m trying to create an ajax page loader so the audio stream won’t get interrupted.


Here is my site Read-Only: RO link!
Skärmavbild 2021-04-08 kl. 00.24.51|387x500 Skärmavbild 2021-04-08 kl. 00.23.49

[1]: Live site
[2]: https://university.webflow.com/article/sharing-your-sites-read-only-link

Problem is with this line of code…
let main = document.querySelector('body > main');