Please update the file a minor bug

find on line 20 of system/engine/session_drivers/file.php

PHP Code: 
public function read($id)
{
    
$sess_file $this->save_path "/sess_" $id;
    return (string) 
file_get_contents($sess_file);

with

PHP Code: 
public function read($id)
{
    
$sess_file $this->save_path "/sess_" $id;
    if(
file_exists($sess_file) && is_readable($sess_file))
    {
        return (string) 
file_get_contents($sess_file);
    }
    return 
false;