Javascript ng repeat无法读取属性'；插入前'；数据重新加载3次后的空值

我正在使用Slick Slider（）在我的网页底部显示一个水平滑块：

<div class="container" ng-if="loop">
  <div class="row">
    <slick dots="true" init-onload="true" data="schedule" center-mode="false" infinite="false" speed="300" slides-to-show="4" touch-move="true" slides-to-scroll="1" class="slider one-time">
      <div ng-repeat="x in schedule">
        <div class="status-x-current">
          <a class="x-button" ng-if="x.title == ''" data-ng-click="showRes(workplace, x)">Click here to to do something</a>
          <h3 ng-if="x.title != ''" id = "x_title1" class="x-slider-title">Titel: {{x.title}}</h3>
          <h3 ng-if="x.title != ''" id = "x_time1" class="x-slider-time">{{x.date}}</h3>
      </div>
      </div>
    </slick>
</div>

这在重新加载前2次计划时效果很好，但在第三次之后，它会给我以下错误：

TypeError: Cannot read property 'insertBefore' of null
    at angular.js?body=1:3851
    at forEach (angular.js?body=1:304)
    at Object.$AnimateProvider.$get.enter (angular.js?body=1:3850)
    at angular.js?body=1:18726
    at publicLinkFn (angular.js?body=1:5421)
    at ngRepeatAction (angular.js?body=1:18724)
    at Object.$watchCollectionAction [as fn] (angular.js?body=1:11300)
    at Scope.$get.Scope.$digest (angular.js?body=1:11396)
    at Scope.$get.Scope.$apply (angular.js?body=1:11635)
    at done (angular.js?body=1:7636)(anonymous function) @ angular.js?body=1:9038$get @ angular.js?body=1:6649$get.Scope.$digest @ angular.js?body=1:11408$get.Scope.$apply @ angular.js?body=1:11635done @ angular.js?body=1:7636completeRequest @ angular.js?body=1:7802xhr.onreadystatechange @ angular.js?body=1:7758

---

我100%确定每次重新加载时，日程安排都完全相同。我想这是因为

initonload=“true”data=“schedule”

。从html中删除该行后，不会发生此错误。但移除这条线会导致slick行为不正确。当删除

init onload=“true”data=“schedule”

时，Slick将把所有幻灯片塞进屏幕，而不是只显示4张幻灯片（幻灯片到show=“4”）？我有一个类似的问题，只有在第二次数据加载之后才会发生。不，我只是决定不使用slick slider。

TypeError: Cannot read property 'insertBefore' of null
    at angular.js?body=1:3851
    at forEach (angular.js?body=1:304)
    at Object.$AnimateProvider.$get.enter (angular.js?body=1:3850)
    at angular.js?body=1:18726
    at publicLinkFn (angular.js?body=1:5421)
    at ngRepeatAction (angular.js?body=1:18724)
    at Object.$watchCollectionAction [as fn] (angular.js?body=1:11300)
    at Scope.$get.Scope.$digest (angular.js?body=1:11396)
    at Scope.$get.Scope.$apply (angular.js?body=1:11635)
    at done (angular.js?body=1:7636)(anonymous function) @ angular.js?body=1:9038$get @ angular.js?body=1:6649$get.Scope.$digest @ angular.js?body=1:11408$get.Scope.$apply @ angular.js?body=1:11635done @ angular.js?body=1:7636completeRequest @ angular.js?body=1:7802xhr.onreadystatechange @ angular.js?body=1:7758