Picture @ homepage doesn't load for unlogged viewer

My YunoHost server

Hardware: Old laptop or computer
YunoHost version: 11
I have access to my server : Through SSH | through the webadmin | direct access via keyboard / screen | …
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no /

Description of my issue

I am using wikijs as CMS and simple groupware to provide my guests and associates with documents and commenting system. So far so good, but now I got a problem with pictures. On my homepage (https://ziutka.pl) and other pages as well, there are pictures which refuse to load for visitors who are not logged in. Instead, there is a cryptic “Unknown error” red tab and eternally swirling circle just besides language selector.

As soon as I log in, the problem vanishes.

Hjalp pleeze!

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