Wordfence is detecting an error:
[Sep 25 19:42:41] Fatal error: Uncaught Error: Call to a member function home_page_url() on null in /home/public_html/wp-content/plugins/cornerstone/includes/classes/admin/class-updates.php:135 Stack trace: #0 /home/8
So I reached out to Wordfence and they in turn told me to reach out to you.
I have seen a number of similar errors being reported for this plugin in their support forum.
If it is the same plugin then I would speak to their support team as this is a problem unrelated to Wordfence and a bug in this plugin is causing the conflict which isn’t allowing Wordfence to operate properly.
It looks like it might be a problem with the plugins update function. I wouldn’t want to elaborate on that though as it would be best for the plugin support team to confirm this for you.
Please advise.