Getting artwork by ID

[Biddy Mahy]

Strangely, if I implement a search term in API playground for the GET api/artworks route, I receive an array of artworks all fine and good. When I take an ID from one of these artworks and place it in the GET api/artworks/:id section of the playground, I get an error. 

This is the id: "5f60cd5b5c51490013e677b6"

I get this information if I use the search term 'andy warhol' in the get/api/artworks route. I don't receive this information if I use this ID in GET api/artworks/:id. 

This is the sucessful request url: https://api.artsy.net/api/artworks?size=5&term=andy%20warhol&page=1

This is the failing request url: https://api.artsy.net/api/artworks/5f60cd5b5c51490013e677b6

Can anyone explain why this is happening?

Cheers, Bridget.