Hello There,
Thanks for writing in! Is this happened right after you have updated the theme and Cornerstone? You are having a caching issue. After doing the updates, always remember to clear all caches (if you are using WP Rocket, WP SuperCache or W3 Total Cache) when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
I found out that you are using CloudFlare. Please login to your CloudFlare account and purge your site cache. The minified JS/CSS in your CF settings should also be regenerated. For best results, please make use of the recommended CloudFlare settings which you can find it here: https://xthemetips.com/using-cloudflare-rocket-loader-with-x-pro-and-x5/928/
Hope this helps. Please let us know how it goes.