Need help with my TidyHelper

Hello.

i have this little helper that works ok with standard HTML pages but
it screws up all my PDF reports

class TidyHelper extends AppHelper {

function __construct() {
ob_start();
}

function __destruct() {
$output = ob_get_clean();
if(class_exists("Tidy")) {
//here's the tidy code
}
echo $output;
}

}

what can i do to disable this helper when the layout = "PDF"?
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