Index: cas.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/cas/cas.module,v
retrieving revision 1.58
diff -u -r1.58 cas.module
--- cas.module	11 Aug 2009 14:52:24 -0000	1.58
+++ cas.module	6 Oct 2009 17:20:20 -0000
@@ -778,7 +778,7 @@
   $destination = preg_replace("/(destination=|caslogout)/", "", drupal_get_destination());
   
   //Make it an absolute url.  This will also convert <front> to the front page.
-  $destination = url($destination, array('absolute' => TRUE));
+  if ($destination) $destination = url($destination, array('absolute' => TRUE));
 
   // If there was no override and admin has set and enabled a logout destination, look for it
   if (empty($destination) && variable_get('cas_logout_redirect', 0)) {