Critical Error viewing Reports

Client contacted me this morning to indicate that her reports page no longer worked.

When I checked, everything worked except for the /wp-admin/edit.php?post_type=wpep_reports page, and she was getting the “There has been a critical error on this website. Please check your site admin email inbox for instructions” error message, and no email was sent.

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