WordPress database error: [Not unique table/alias: 'u']
SELECT DISTINCT u.id FROM wp_users u LEFT JOIN wp_usermeta AS um ON u.id = um.user_id LEFT JOIN wp_posts AS p2 ON p2.ID = p.post_parent LEFT JOIN wp_users AS u ON u.id = p.post_author WHERE um.meta_value IS NULL AND um.meta_key = 'appear_in_members_directory' WHERE p.post_type = 'wc_user_membership' AND p.post_status IN ('wcm-active', 'wcm-paused') AND p2.post_type = 'wc_membership_plan'