Index: wp-includes/user.php
===================================================================
--- wp-includes/user.php	(revision 20079)
+++ wp-includes/user.php	(working copy)
@@ -936,7 +936,7 @@
 	else
 		$user = new WP_User($for_user_id);
 
-	$userdata   = $user;
+	$userdata   = null;
 	$user_ID    = (int) $user->ID;
 	$user_level = (int) isset($user->user_level) ? $user->user_level : 0;
 
@@ -945,6 +945,7 @@
 		return;
 	}
 
+	$userdata   = $user;
 	$user_login	= $user->user_login;
 	$user_email	= $user->user_email;
 	$user_url	= $user->user_url;