Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.466
diff -u -F^f -r1.466 common.inc
--- includes/common.inc	11 Aug 2005 12:57:41 -0000	1.466
+++ includes/common.inc	16 Aug 2005 00:12:59 -0000
@@ -558,7 +559,7 @@ function locale_initialize() {
     // Useful for e.g. XML/HTML 'lang' attributes.
     $languages = array('en' => 'English');
   }
-  if ($user->uid && $languages[$user->language]) {
+  if ($user->uid && isset($languages[$user->language])) {
     return $user->language;
   }
   else {