Super shows this problem when Notion returns no content for a page that is still on your site. Visitors get a 404 at its URL.
Why it happens
Notion stops returning a page when it was:
- deleted or moved to Trash
- unpublished (Share → Publish turned off), or the page is no longer shared,
- permanently deleted from Trash.
Super keeps the page in your site's page list, so you can decide what should happen with its URL.
How to fix it
You still want the page:
- In the Super dashboard, open Pages, click the three dots next to the page and choose View in Notion.
- In Notion, restore the page from Trash, or turn Share → Publish back on.
- Back in Super, click the refresh button in the dashboard preview.
The page is gone for good:
- Redirect it to the page that replaced it (or to your home page). This keeps visitors and search engines away from a 404 and keeps the URL's search ranking. See Beginner's Guide to Page Redirects.
- Or delete it from your site in Pages (three dots → remove). Visitors then get a normal 404 at this URL.