New session each refresh

My codeigniter 3.1.10 keeps giving a new session on each refresh nearly. Cannot figure out why but i'm up to like 1.3 million of them now

PHP Code:

$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'v_session';
$config['sess_expiration'] = 0;
$config['sess_save_path'] = 'users_sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = TRUE;