Unable to filter Favorites as 'Random'

Using Chrome 71.0.3578.98 I've been unable to sort my favorites by 'Random'.  I used to be able to just click into favorites, select 'Random' from the drop down and have my favorites arranged by 'Random'.  Now when I try to do that it says "Search error (500)" with plain black text on a plain white page.

Thanks for your help!

This is now fixed.