[WP Smush Pro] WP Smush Pro Conflicts with X Theme

The latest version of WP Smush PRO (Version 2.7.9) conflicts with the Cornerstone builder of X theme Version: 6.0.4 by Themeco (https://theme.co/x/). It won't load Cornerstone when editing a page (the page is completely blank).

Cornerstone worked perfectly just before I upgraded to WP Smush PRO (Version 2.7.9), and if I deactivate WP Smush PRO then Cornerstone works fine again.