Defer Javascript with Master Slider

  • I am trying to optimise my website by deferring Javascript.
    I’m using this code on functions.php

    if (!(is_admin() )) {
  function defer_parsing_of_js ( $url ) {
    if ( FALSE === strpos( $url, '.js' ) ) return $url;
    if ( strpos( $url, 'jquery.js' ) ) return $url;
    return "$url' defer ";
  }
  add_filter( 'clean_url', 'defer_parsing_of_js', 11, 1 );
}

    Everything else (other plugins) is working fine except Master Slider, it disappears from the page once I activate Defer Javascript.
    What should I do?

    https://www.ads-software.com/plugins/master-slider/

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