Ticket #13760: use-wpmu_validate_user_signup.13760.diff

wp-includes/ms-functions.php

@@ -731 +731 @@
         $meta = unserialize($signup->meta);
         $user_login = $wpdb->escape($signup->user_login);
         $user_email = $wpdb->escape($signup->user_email);
-        wpmu_validate_user_signup($user_login, $user_email);
+        $result = wpmu_validate_user_signup($user_login, $user_email);
+        if ( empty( $result['errors']->errors ) ) {
+                $user_login = $result['user_name'];
+                $user_email = $result['user_email'];
+        } else {
+                return $result['errors'];
+        }
+
         $password = wp_generate_password();
 
         $user_id = username_exists($user_login);