Laravel SSL problems certificate Error on android Old version

When I open my website by old android smartPhone I get an error like this "SSL certificates as insecure"! my website has designed by laravel 5.5 and problem is only on android default browser! https://www.gokcekmarket.com

from Newest questions tagged laravel-5 - Stack Overflow https://ift.tt/2RmJeuu
via IFTTT