You mean line 220 (3rd line in the following function)?
function wpcf_pr_admin_post_meta_box_belongs_form( $post, $type, $belongs ) { global $wpdb; if ( empty( $post ) ) { return array(); } $temp_type = get_post_type_object( $type ); if ( empty( $temp_type ) ) { return array(); } $form = array(); $options = array( __( 'Not selected', 'wpcf' ) => 0, );