[Resolved] Listing Details: unable to upload any image (snap icon, images or featured banner)

When I try to upload images on the snap listing details page, I get this error after saving:

AttributeError: ‘NoneType’ object has no attribute ‘media_upload’

Does anyone have a solution?

Snapcraft team is handling the problem. See this issue: https://github.com/canonical-web-and-design/snapcraft.io/issues/2588