Vue.js Prod version Error IE11 "Expected identifier, string or number"

I'm trying to run my new webpage in IE11 (testing the compatibility across browsers) and I have an error in console log, and got a blank page for any route.

I'm using webpack, running: npm run build. To be able to see the code, I disabled the UglifyJSPlugin In Chrome there were no errors, and the pages appeared correctly. But in IE11 I got the following error:

SCRIPT1028: Expected identifier, string or number
File: build.js, Line: 828, Column: 7

When I clicked on the Line / Column, it appeared the following code:

...
"use strict";
/*
 * SSR Safe Client Side ID attribute generation
 *
 */

/* harmony default export */ __webpack_exports__["a"] = ({
  props: {
    id: {
      type: String,
      default: null // This is the line of the error
    }
  },
  methods: {
    safeId: function safeId() {
      var suffix = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : '';

      var id = this.id || this.localId_ || null;
      if (!id) {
        return null;
      }
      suffix = String(suffix).replace(/\s+/g, '_');
      return suffix ? id + '_' + suffix : id;
    }
  },
  computed: {
    localId_: function localId_() {
      if (!this.$isServer && !this.id && typeof this._uid !== 'undefined') {
        return '__BVID__' + this._uid;
      }
    }
  }
});
...

I do not know what's happening and why IE11 I'm having a blank page instead of the correct pages. I have already tried to use babel-polyfill, so my webpak.config.js starts with:

var path = require('path')
var webpack = require('webpack')

module.exports = {
  entry: {
    app: ['babel-polyfill','./src/main.js']
  },
...

and I tryed to import es6-promise too, in my main.js:

import 'es6-promise/auto'

Now, I'm really lost. Could someone help me?