diff -rupN uc_product_keys/uc_product_keys.admin.inc uc_product_keys_new/uc_product_keys.admin.inc
--- uc_product_keys/uc_product_keys.admin.inc	2009-12-20 06:39:13.000000000 +1100
+++ uc_product_keys.admin.inc	2010-01-13 10:15:32.372315545 +1100
@@ -178,8 +178,7 @@ function uc_product_keys_list_sequences_
       $end_length = strlen($end_string);
 
       foreach ($form as $name => $item) {
-	if ((strrpos($name, $end_string) == strlen($name) - $end_length) &&
-	    isset($item['#default_value']) && $item['#default_value'] != $item['#value']) {
+        if ((strrpos($name, $end_string) == strlen($name) - $end_length) && $item['#default_value'] != $item['#value']) {
 	  $dirty = true;
 	  break;
 	}