Work around Highcharts stack issue

https://github.com/highcharts/highcharts/issues/5671

by ismusidhu

HTML

<script src="http://code.highcharts.com/highcharts.js"></script>
<div id="container"></div>

JavaScript

$(function() {

  var series = [
  {
    "color": "red",
    "data": [
      [1509461400000, null],
      [1509538800000, null],
      [1509539100000, 2554950],
      [1509539400000, 2554950],
      [1509539700000, 6523690],
      [1509540000000, 7937480],
      [1509540300000, 15829500],
      [1509540600000, 5246220],
      [1509540900000, 10447000],
      [1509541200000, 6569130],
      [1509541500000, 3923300],
      [1509541800000, 5155340],
      [1509542100000, 9104860],
      [1509542400000, 10447000],
      [1509542700000, 19616500],
      [1509543000000, 11860800],
      [1509543300000, 13229100],
      [1509543600000, 7892040],
      [1509543900000, 14445400],
      [1509544200000, 13103300],
      [1509544500000, 16790700],
      [1509544800000, 18087400],
      [1509545100000, 10275700],
      [1509545400000, 6317480],
      [1509545700000, 11021900],
      [1509546000000, 3923300],
      [1509546300000, 10240800],
      [1509546600000, 7811650],
      [1509546900000, 16855300]
    ],
    "marker": {
      "enabled": false
    },
    "stack": "positive",
    "type": "area",
    "_symbolIndex": 0
  },
  {
    "color": "blue",
    "data": [
      [1509461400000, null],
      [1509538800000, null],
      [1509539100000, 2554950],
      [1509539400000, 2554950],
      [1509539700000, 6523690],
      [1509540000000, 7937480],
      [1509540300000, 15829500],
      [1509540600000, 5246220],
      [1509540900000, 10447000],
      [1509541200000, 6569130],
      [1509541500000, 3923300],
      [1509541800000, 5155340],
      [1509542100000, 9104860],
      [1509542400000, 10447000],
      [1509542700000, 19616500],
      [1509543000000, 11860800],
      [1509543300000, 13229100],
      [1509543600000, 7892040],
      [1509543900000, 14445400],
      [1509544200000, 13103300],
      [1509544500000, 16790700],
      [1509544800000, 18087400],
      [1509545100000, 10275700],
      [1509545400000, 6317480],
      [1509545700000, 11021900],
      [1509546000000,...