Ticket #24992: 24992.patch

src/wp-admin/includes/user.php

@@ -195 +195 @@
  * @since 2.0.5
  *
  * @param int $user_id User ID.
- * @return object WP_User object with user data.
+ * @return bool|WP_User False on failure, WP_User object on success.
  */
 function get_user_to_edit( $user_id ) {
         $user = get_userdata( $user_id );
 
-        $user->filter = 'edit';
+        if ( $user )
+                $user->filter = 'edit';
 
         return $user;
 }