Community Auth - a database error when logging in

What is your session config look like? Have you set base_url in config/config? Did you properly set up your encryption key?

Thanks for your reply !

My session config :

PHP Code:

$config['sess_driver'] = 'files';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 7200;
$config['sess_save_path'] = sys_get_temp_dir();
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE; 


base_url is set (I use it with the url helper) and the encryption key is set like this : 

PHP Code:

$config['encryption_key'] = hex2bin('8ef3f3cf7643c5d5a29e307c0c1714f4');