The case is that href attr is empty. Try to change sidenav code for this, or just set each href to href="#"

<nav id="sidenav-1" class="sidenav" data-mdb-hidden="false" data-mdb-accordion="true">
    <a class="ripple d-flex justify-content-center py-4" href="#!" data-mdb-ripple-color="primary">
      <img id="MDB-logo" src="https://mdbootstrap.com/wp-content/uploads/2018/06/logo-mdb-jquery-small.png"
        alt="MDB Logo" draggable="false" />
    </a>

    <ul class="sidenav-menu">
      <li class="sidenav-item">
        <a class="sidenav-link" href="#">
          <i class="fas fa-chart-area fa-fw me-3"></i
          ><span>Webiste traffic</span></a
        >
      </li>
      <li class="sidenav-item">
        <a class="sidenav-link"
          ><i class="fas fa-cogs fa-fw me-3"></i><span>Settings</span></a
        >
        <ul class="sidenav-collapse">
          <li class="sidenav-item">
            <a class="sidenav-link">Profile</a>
          </li>
          <li class="sidenav-item">
            <a class="sidenav-link">Account</a>
          </li>
        </ul>
      </li>
      <li class="sidenav-item">
        <a class="sidenav-link"
          ><i class="fas fa-lock fa-fw me-3"></i><span>Password</span></a
        >
        <ul class="sidenav-collapse">
          <li class="sidenav-item">
            <a class="sidenav-link">Request password</a>
          </li>
          <li class="sidenav-item">
            <a class="sidenav-link">Reset password</a>
          </li>
        </ul>
      </li>

      <li class="sidenav-item">
        <a class="sidenav-link" href="#">
          <i class="fas fa-chart-line fa-fw me-3"></i
          ><span>Analytics</span></a
        >
      </li>
      <li class="sidenav-item">
        <a class="sidenav-link" href="#">
          <i class="fas fa-chart-pie fa-fw me-3"></i
          ><span>SEO</span></a
        >
      </li>
      <li class="sidenav-item">
        <a class="sidenav-link" href="#">
          <i class="fas fa-chart-bar fa-fw me-3"></i
          ><span>Orders</span></a
        >
      </li>
      <li class="sidenav-item">
        <a class="sidenav-link" href="#">
          <i class="fas fa-globe fa-fw me-3"></i
          ><span>International</span></a
        >
      </li>
      <li class="sidenav-item">
        <a class="sidenav-link" href="#">
          <i class="fas fa-building fa-fw me-3"></i
          ><span>Partners</span></a
        >
      </li>
      <li class="sidenav-item">
        <a class="sidenav-link" href="#">
          <i class="fas fa-calendar fa-fw me-3"></i
          ><span>Calendar</span></a
        >
      </li>
      <li class="sidenav-item">
        <a class="sidenav-link" href="#">
          <i class="fas fa-users fa-fw me-3"></i
          ><span>Users</span></a
        >
      </li>
      <li class="sidenav-item">
        <a class="sidenav-link" href="#">
          <i class="fas fa-money-bill fa-fw me-3"></i
          ><span>Sales</span></a
        >
      </li>
    </ul>
  </nav>