Index: sites/all/modules/link/link.module
===================================================================
--- sites/all/modules/link/link.module	(date 1318581014000)
+++ sites/all/modules/link/link.module	(revision )
@@ -492,7 +492,7 @@
                         array('b', 'br', 'code', 'em', 'i', 'img', 'span', 'strong', 'sub', 'sup', 'tt', 'u'));
   }
   // Remove title attribute if it's equal to link text.
-  if ($item['attributes']['title'] == $item['title']) {
+  if (isset($item['attributes']['title']) && $item['attributes']['title'] == $item['title']) {
     unset($item['attributes']['title']);
   }
   unset($item['attributes']['configurable_title']);