--- a/wp/wp-admin/network/site-themes.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-admin/network/site-themes.php	Wed Sep 21 18:19:35 2022 +0200
@@ -40,7 +40,7 @@
 	$referer = add_query_arg( 'paged', (int) $_REQUEST['paged'], $referer );
 }
 
-$id = isset( $_REQUEST['id'] ) ? intval( $_REQUEST['id'] ) : 0;
+$id = isset( $_REQUEST['id'] ) ? (int) $_REQUEST['id'] : 0;
 
 if ( ! $id ) {
 	wp_die( __( 'Invalid site ID.' ) );