[Plugin: NextGEN Gallery] Warning: Division by Zero

https://scrawlfx.com/2008/06/vampire-rain-altered-species-first-three-screenshots

Yeah, so the screens won’t show but the clicking still leads to the image. When I uploaded them, I got this error, but the thumbnails and everything was created:

Warning: Division by zero in /home/.galled/scrawlfx/scrawlfx.com/wp-content/plugins/nextgen-gallery/lib/thumbnail.inc.php on line 770

How do I get them to show