Ticket #15620: 15620.diff

wp-admin/network.php

@@ -307 +307 @@
         global $base, $wpdb;
         $hostname = get_clean_basedomain();
 
+        if ( is_null( $base ) )
+                $base = trailingslashit( stripslashes( dirname( dirname( $_SERVER['SCRIPT_NAME'] ) ) ) );
+
         // Wildcard DNS message.
         if ( is_wp_error( $errors ) )
                 echo '<div class="error">' . $errors->get_error_message() . '</div>';