#27 Call error

[Anonymous]

Name: Huisman
Email: daniel.huisman@reitdiep.nl

There is a problem on line 155:
Fatal error: Call to a member function on a non-object in c:\program files\nusphere\apache\nsdocs\bibi\chat\include\class.Chat.inc on line 155.

Can you solve this probleme here are lines 154-156:
$flag_path = $flag_dir.'/'.strtolower($lang).'.gif';
if( file_exists($_SESSION['template']->get_tmpl_sys_path().$flag_path) )
return '<img src="'.$_SESSION['template']->get_tmpl_web_path().$flag_path.'" align="middle" alt="'.$_SESSION['translator']->out('CHOOSE_LANGUAGE').'" border="0" />';