Error when session expires

[Justin Hayes]

getting this error when the session expires and the user is logged out

Notice: Undefined index: system_id in /home/jhayes/vhosts/bookmyaircraft.com/webroot/includes/system.php on line 28 Notice: Undefined index: user in /home/jhayes/vhosts/bookmyaircraft.com/webroot/includes/system.php on line 30