--- uc_cart_checkout_pane.inc.orig	2011-03-11 22:13:32.000000000 +0600
+++ uc_cart_checkout_pane.inc	2011-04-25 15:15:52.108939462 +0700
@@ -463,7 +463,7 @@
 
   foreach (element_children($form) as $field) {
     if (substr($field, 0, 9) == 'delivery_' || substr($field, 0, 8) == 'billing_') {
-      $title = $form[$field]['#title'] . ':';
+      $title = (isset($form[$field]['#title'])) ? $form[$field]['#title'] . ':' : ''; // fix
       unset($form[$field]['#title']);
       if (substr($field, -7) == 'street1') {
         $title = uc_get_field_name('street') . ':';