-if ( isset($action) && $action == 'edit' && !$ID ) {
- wp_die( __( 'Cheatin’ uh?' ), 403 );
+if ( isset( $action ) && $action == 'edit' && !$ID ) {
+ wp_die(
+ '<h1>' . __( 'Cheatin’ uh?' ) . '</h1>' .
+ '<p>' . __( 'Invalid item ID.' ) . '</p>',
+ 403
+ );