ng-bootstrap下拉列表在Angular 5的Firefox中不起作用？

Question

我在棱角项目中使用ng-bootstrap 1.0.1。在chrome (latest version).中工作正常，但在firefox (latest version)中，单击下拉按钮时抛出错误too much recursion。

<div class="row">
  <div class="col">
    <div ngbDropdown class="d-inline-block">
       <button class="btn btn-outline-primary" id="dropdownBasic1" ngbDropdownToggle>Toggle dropdown</button>
       <div ngbDropdownMenu aria-labelledby="dropdownBasic1">
        <button class="dropdown-item">Action - 1</button>
         <button class="dropdown-item">Another Action</button>
        <button class="dropdown-item">Something else is here</button>
      </div>
   </div>
</div>

将ng-bootstrap软件包1.0.0升级到2.0.0后，出现以下错误消息，

错误：