diff -r be944660c56a -r 3d72ae0968f4 wp/wp-includes/ms-default-constants.php
--- a/wp/wp-includes/ms-default-constants.php	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-includes/ms-default-constants.php	Tue Sep 27 16:37:53 2022 +0200
@@ -68,7 +68,8 @@
 	 * @since 2.6.0
 	 */
 	if ( ! defined( 'ADMIN_COOKIE_PATH' ) ) {
-		if ( ! is_subdomain_install() || trim( parse_url( get_option( 'siteurl' ), PHP_URL_PATH ), '/' ) ) {
+		$site_path = parse_url( get_option( 'siteurl' ), PHP_URL_PATH );
+		if ( ! is_subdomain_install() || is_string( $site_path ) && trim( $site_path, '/' ) ) {
 			define( 'ADMIN_COOKIE_PATH', SITECOOKIEPATH );
 		} else {
 			define( 'ADMIN_COOKIE_PATH', SITECOOKIEPATH . 'wp-admin' );