BUG error database without www

Hi I found a bug. If I acess my webpage whitout www I see a error: Error establishing a database connection

When i open my website with http://www.mysite… the site open OK.

PS: In general at my wordpress conf I have a www in my address.

Disabling = define(‘WP_CACHE’, false), the system automatic redirect non www to www address and open ok.

https://wordpress.org/plugins/w3-total-cache/