Your site is currently using PHP 7.0.33-0+deb9u10. This version of PHP has become End-of-Life since Thursday, 10 January 2019. It has not received security updates for a very long time. You MUST NOT use it for a live site!
Akeeba Kickstart will stop supporting your version of PHP very soon. You must very urgently upgrade to a newer version of PHP. We recommend PHP 7.3.0 or later. You can ask your host or your system administrator for instructions. It's easy and it will make your site faster and more secure.