--- friendfeed.module.orig	2008-07-08 21:11:09.000000000 -0400
+++ friendfeed.module	2008-07-08 21:11:21.000000000 -0400
@@ -200,7 +200,11 @@ function friendfeed_user_feed($username,
  */
 function friendfeed_user_view_uid($uid, $service = NULL, $start = 0, $num = 30) {
   $user = user_load(array('uid' => $uid));
-  return friendfeed_user_view($user, $service, $start, $num);
+  if ($user->friendfeed_username && $user->friendfeed_key) {
+    return friendfeed_user_view($user, $service, $start, $num);
+  } else {
+    return '<p>' . t('This user does not have a FriendFeed configuration.') . '</p>';
+  }
 }
 
 /**