PHP Warning with WP CLI

Hi,

When using WP CLI commands such as wp option get wp_template_root, the plugin return notices which prevent to get expected data from external scripts:

admin@xxx:/srv/www/xxx.net/current$ wp option get wp_template_root
PHP Notice:  Undefined index: HTTP_HOST in /srv/www/xxx.net/current/web/app/plugins/wp-super-cache/wp-cache-base.php on line 6
Notice: Undefined index: HTTP_HOST in /srv/www/xxx.net/current/web/app/plugins/wp-super-cache/wp-cache-base.php on line 6

Can you fix it?

Thanks!