Ticket #22787: 22787.2.diff

wp-includes/ms-functions.php

@@ -540 +540 @@
  * @return array Contains the new site data and error messages.
  */
 function wpmu_validate_blog_signup($blogname, $blog_title, $user = '') {
-        global $wpdb, $domain, $base, $current_site;
+        global $wpdb, $domain, $current_site;
 
+        $base = $current_site->path;
+
         $blog_title = strip_tags( $blog_title );
         $blog_title = substr( $blog_title, 0, 50 );