SiteGround Admin Panel Redirect

Hi! I spotted a recurring error that happens in my SiteGround Admin and could be happening for others.
When trying to access wp-admin panel from the list of website I’m redirected to this kind of link/error deprecated: Unparenthesized a ?%20b%20:%20b%20?%20d%20:%20e%20is%20deprecated.%20Use%20either%20(a%20?%20b%20:%20c)%20?%20d%20:%20e%20or%20b%20?%20b%20:%20(c%20?%20d%20:%20e)%20in%20/home/customer/www/domaine.com/public_html/wp-content/plugins/redirect-by-cookie/_wp_config_addon.php%20on%20line%