Triggered this error while playing with the sort desc checkbox and the apply button that are only visible on this page at mobile screen width:

https://latest.datasette.io/fixtures/compound_three_primary_keys?_sort_desc=pk1

Navigate to that page (with the browser narrow enough to show the box), un-check the box and click Apply:

Also notable: I managed to get to a page with ?_sort_desk=pk1 in the URL three times by clicking around with that button.