Gap in pagination chain?

[Will Naylor]

Hi, I am trying to access the image URLs for all the artworks through pagination as part of a deep learning project, but it seems that when I get to number 5517 (The Shepherd's Song by Pierre Puvis de Chavannes), there isn't a 'Next' artwork to move to. Perhaps I am missing something, but could there be a break in the chain here? Many thanks, Will