How to report a bad pdf to scihub?

So imagine you looked for a pdf on scihub, found the correct one but it turned out all pages except the title page were blank. How would one fix it?

Browser Extension Adds Sci-Hub Download Links to Publishers’ Websites * TorrentFreak

Home > Piracy > As scientists and academics of all kinds turn to Sci-Hub to freely access scientific papers, a new browser tool aims to make access even more straightforward. Currently available from the Mozilla addon store but also compatible with Chrome, ‘Sci-Hub Injector’ embeds Sci-Hub download links into popular publishers’ websites. Given its reputation… Continue reading Browser Extension Adds Sci-Hub Download Links to Publishers’ Websites * TorrentFreak