Menü Mobilde Açılıyor Ama Kapanmıyor Js

    <nav class="navbar custom-navbar navbar-expand-md navbar-light fixed-top" data-spy="affix" data-offset-top="10">
        <div class="container">
            <a class="navbar-brand" href="#">
                <img src="assets/imgs/logo.svg" alt="">
            </a>
            <button class="navbar-toggler ml-auto" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>
            <div class="collapse navbar-collapse" id="navbarSupportedContent">
                <ul class="navbar-nav ml-auto">
                    <li class="nav-item">
                        <a class="nav-link nvlkk" href="#service">Hizmetlerimiz</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link nvlkk" href="#about">Hakkımızda</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link nvlkk" href="#">Ürünler</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link nvlkk" href="#blog">Haberler</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link nvlkk" href="#contact">İletişim</a>
                    </li>
                </ul>
            </div>
        </div>
    </nav>

var menuOpen = false;
$(".navbar .nav-link").on('click', function(event) {
    if (this.hash !== "") {
        event.preventDefault();
        var hash = this.hash;
        if (!menuOpen) {
            $('html, body').animate({
                scrollTop: $(hash).offset().top
            }, 700, function(){
                window.location.hash = hash;
            });
            menuOpen = true;
        } else {
            $(".navbar-collapse").collapse('hide');
            $(".navbar-toggler").removeClass('open');
            menuOpen = false;
        }
    }
});