Scan hangs with error message

I have large site with huge big photos. I need know, which photos are orphaned. But scanner failed with error:

Media Cleaner – Clean & Optimize Space
There are issue with your files, accounting for 0.00 MB. Your trash contains 0.00 MB.

https://i.imgur.com/aQpPNGX.png