[Vue warn]: Error in render: "TypeError: Unable to get property 'Id' of undefined or null reference

Question

tested it with chrome, firefox, opera and internet explorer and the error only occurs in firefox.

I have two computed properties in vue js and they change pretty much at the same time.
when i change my select box both get triggered because this.gekozenWinding get changed when i select a different option inside the select box.

Here is my code for both properties:

kant() {
  if (this.gekozenWinding != null) {
    var id = this.haalID(this.windings, this.gekozenWinding);
    parseInt(id);
    if (id < 5 && id > 0) return true;
    else {
      return false;
    }
  }
},
graden() {
  if (this.gekozenWinding != null) {
    var id = this.haalID(this.windings, this.gekozenWinding);
    switch (id) {
      case "1":
        return "180"; break;
      case "2":
        return "0"; break;
      case "3":
        return "270"; break;
      case "4":
        return "90"; break;
      case "5":
        return "180"; break;
      case "6":
        return "0"; break;
      case "7":
        return "270"; break;
      case "8":
        return "90"; break;
    }
  } else {
    return "0";
  }
}

My method haalID()

    haalID(lijst, item) {
  /*
  1.Filters out given item(string) from a lijst(array).
  2.Gets the ID from the filtered object.
  3. returns the ID
  */
  var id = lijst.filter(i => i.Descriptions[0].Description == item);
  id = id[0].Id;
  return id;
}

And this is inside my template

          <div class="row">
        <div class="form-group col-9">
          <label>Winding</label>
          <select
            class="form-control"
            v-model="gekozenWinding"
          >
            <option
              v-for="winding in windings"
              v-bind:key="winding.Id"
            >{{winding.Descriptions[0].Description}}</option>
          </select>
        </div>
      </div>
      <div v-if="gekozenWinding != null && gekozenWinding != 'To determine'">
        <div class="parent1" v-if="kant ">
          <img id="fto1" src="../assets/buitenkant.png" alt>
          <img
            id="fto2"
            v-bind:style="{'transform': `rotate(${graden}deg)`}"
            src="../assets/A.png"
            alt
          >
        </div>
        <div class="parent2" v-else>
          <img id="fto3" src="../assets/Binnenkant.png" alt>
          <img
            id="fto4"
            v-bind:style="{'transform': `rotate(${graden}deg)`}"
            src="../assets/A.png"
            alt
          >
        </div>
      </div>

Again this only occurs in internet explorer(using the 11) other browsers works perfectly.
I even tried to change my code mutliple times can't get it to work in IE

Answer 1

Arrow functions are not supported in IE11 (or any IE for that matter).

caniuse.com/#search=arrow%20functions -

You'll need to use a compiler like Babel, or avoid arrow functions.

var id = lijst.filter(function (i) {
  return i.Descriptions[0].Description == item;
});