Ticket #22090: 22090.5.diff

Index: wp-admin/includes/schema.php
===================================================================
--- wp-admin/includes/schema.php        (revision 22236)
+++ wp-admin/includes/schema.php        (working copy)
@@ -926,24 +926,26 @@
        }
        $wpdb->query( "INSERT INTO $wpdb->sitemeta ( site_id, meta_key, meta_value ) VALUES " . $insert );
 
-       $current_site = new stdClass;
-       $current_site->domain = $domain;
-       $current_site->path = $path;
-       $current_site->site_name = ucfirst( $domain );
-
-       if ( !is_multisite() ) {
+       // When upgrading from single to multisite, assume the current site will become the main site of the network.
+       // When using populate_network() to create another network in an existing multisite environment,
+       // skip these steps since the main site of the new network has not yet been created.
+       if ( ! is_multisite() ) {
+               $current_site = new stdClass;
+               $current_site->domain = $domain;
+               $current_site->path = $path;
+               $current_site->site_name = ucfirst( $domain );
                $wpdb->insert( $wpdb->blogs, array( 'site_id' => $network_id, 'domain' => $domain, 'path' => $path, 'registered' => current_time( 'mysql' ) ) );
-               $blog_id = $wpdb->insert_id;
+               $current_site->blog_id = $blog_id = $wpdb->insert_id;
                update_user_meta( $site_user->ID, 'source_domain', $domain );
                update_user_meta( $site_user->ID, 'primary_blog', $blog_id );
-       }
 
-       if ( $subdomain_install )
-               $wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-       else
-               $wp_rewrite->set_permalink_structure( '/blog/%year%/%monthnum%/%day%/%postname%/' );
+               if ( $subdomain_install )
+                       $wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
+               else
+                       $wp_rewrite->set_permalink_structure( '/blog/%year%/%monthnum%/%day%/%postname%/' );
 
-       flush_rewrite_rules();
+               flush_rewrite_rules();
+       }
 
        if ( $subdomain_install ) {
                $vhost_ok = false;