Deregister wpp

Hi,

I try to deregister the wpp on certain page templates, without any success. Can you see what is wrong? Thanks

function deregister_wpp() {
   if ( is_page_template( array( 'template1.php', 'template2.php' ) ) ) {
        wp_deregister_script( 'wpp-4.1.0' );
   }
}
add_action( 'wp_enqueue_scripts', 'deregister_wpp' );