Strange Googlebot Image page requests
 

I've seen this a number of times, Googlebot Image requests a page that doesn't exist, such as

/some-page/no-text-7272692650111419765

Always 'no-text' followed by some long number. What is it doing, is it some sort of bug?

It could be an error.

Probably trying to figure out how your server handles a file not found error - a proper 404 response, a 302 to another page, a 200 showing your index page, etc.