Index: moodlelib.php
===================================================================
RCS file: /cvsroot/moodle/moodle/lib/moodlelib.php,v
retrieving revision 1.960.2.101
diff -u -r1.960.2.101 moodlelib.php
--- lib/moodlelib.php	22 Oct 2008 02:33:11 -0000	1.960.2.101
+++ lib/moodlelib.php	23 Oct 2008 01:09:21 -0000
@@ -3384,8 +3384,10 @@
         $user->lastname   = ' ';
     }
 
-    $user->sesskey  = random_string(10);
-    $user->sessionIP = md5(getremoteaddr());   // Store the current IP in the session
+    if (isset($_SERVER['REMOTE_ADDR'])) {
+        $user->sesskey  = random_string(10);
+        $user->sessionIP = md5(getremoteaddr());   // Store the current IP in the session
+    }
 
     return $user;
 }