Storing session information in permanent cookie

Hello,

I am developing an application using CodeIgniter 3.1.4. Below is my session configuration:

Code:

$config['sess_cookie_name']        = 'cisession';
$config['sess_expiration']        = 1200;
$config['sess_use_database']            = TRUE;
$config['sess_table_name']        = 'session';
$config['sess_match_ip']        = TRUE;
$config['sess_time_to_update']            = 300;

During security audit, one issue is flagged as The web application stores sensitive session information in a permanent cookie (on disk). I am advised to use non-permanent cookies (RAM cookies). Please advise as how to achieve it.

Regards,