Fatal error: Uncaught Error: Call to a member function get() on null in /srv/users/pcl/apps/staging/public/wp-includes/query.php:28 Stack trace: #0 /srv/users/pcl/apps/staging/public/wp-content/plugins/piklist/includes/class-piklist-wordpress.php(173): get_query_var('meta_relation') #1 /srv/users/pcl/apps/staging/public/wp-includes/class-wp-hook.php(292): Piklist_WordPress::get_meta_sql(Array, Array, 'user', 'wp_users', 'ID', Object(WP_User_Query)) #2 /srv/users/pcl/apps/staging/public/wp-includes/plugin.php(255): WP_Hook->apply_filters(Array, Array) #3 /srv/users/pcl/apps/staging/public/wp-includes/class-wp-meta-query.php(357): apply_filters_ref_array('get_meta_sql', Array) #4 /srv/users/pcl/apps/staging/public/wp-includes/class-wp-user-query.php(432): WP_Meta_Query->get_sql('user', 'wp_users', 'ID', Object(WP_User_Query)) #5 /srv/users/pcl/apps/staging/public/wp-includes/class-wp-user-query.php(77): WP_User_Query->prepare_query(Array) #6 /srv/users/pcl/apps/staging/public/wp-content/plugins/wp-migrate-db-pro/class/Commo in /srv/users/pcl/apps/staging/public/wp-includes/query.php on line 28