Hello There,
Thanks for updating in! Please be advised that we have released X 5.2.3 and Cornerstone 2.1.4. It is now available in automatic updates. You can now update first to this latest version. This latest release contains fixes for several issues so be sure to check out the changelog (http://theme.co/changelog/).
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.
Please let us know how it goes.