On /wp-admin/users.php?page=view-guest-authors&orderby=last_name&order=asc, I'm seeing this error.
Notice: Trying to get property of non-object in /srv/www/fivethirtyeight/public_html/wp-content/plugins/vip/co-authors-plus/php/class-coauthors-wp-list-table.php on line 256
On /wp-admin/users.php?page=view-guest-authors&orderby=last_name&order=asc, I'm seeing this error.