// Load the required file(s)
require ("inc/config.php");
-if (defined('mxchange_installed') && (mxchange_installed))
+if (defined('mxchange_installed') && (isBooleanConstantAndTrue('mxchange_installed')))
{
// Script is installed so let's check for his confirmation link...
$uid = strip_tags(bigintval($_GET['uid']));