Internal Server Error when trying to enter CDN information

I’m trying to configure WP Fastest Cache with my CDN which is Optimole. The CDN URL for my CDN is https://mllvxl1alsqk.i.optimole.com and trying to save it produces the “Internal Server Error.”

I’ve already tried deactivating most of my plugins to resolve this but that did not help. What else might cause this and how might I resolve this problem?

-Rudi

The page I need help with: [log in to see the link]