=== modified file 'modules/update/update.fetch.inc'
--- modules/update/update.fetch.inc	2007-12-20 08:57:54 +0000
+++ modules/update/update.fetch.inc	2007-12-30 19:39:44 +0000
@@ -205,7 +205,10 @@ class update_xml_parser {
         $this->current_object = &$this->current_release;
         break;
       default:
-        $this->current_object[strtolower($this->current_tag)] = trim($this->current_object[strtolower($this->current_tag)]);
+        $tag = strtolower($this->current_tag);
+        if (isset($this->current_object[$tag])) {
+          $this->current_object[$tag] = trim($this->current_object[$tag]);
+        }
         $this->current_tag = '';
     }
   }