Ticket #25201: 25201.diff

src/wp-includes/link-template.php

@@ -1963 +1963 @@
  * @return string Site url link with optional path appended.
 */
 function get_site_url( $blog_id = null, $path = '', $scheme = null ) {
-        if ( empty( $blog_id ) || !is_multisite() ) {
+        if ( defined( 'WP_INSTALLING' ) && WP_INSTALLING ) {
+                $url = wp_guess_url();
+        } elseif ( empty( $blog_id ) || !is_multisite() ) {
                 $url = get_option( 'siteurl' );
         } else {
                 switch_to_blog( $blog_id );