Highcharts test tool

HTML

<!-- With 5.0.7 the chart stacking is broken -->
<script src="https://code.highcharts.com/highcharts.js"></script>
<!-- With 4.1.6 the chart renders as expected and stacking is OK -->
<!-- <script src="https://code.highcharts.com/4.1.6/highcharts.js"></script> -->

<div id="container"></div>

CSS

#container {
    min-width: 300px;
    max-width: 800px;
    height: 300px;
    margin: 1em auto;
}

JavaScript

$(function() {
  var chart = new Highcharts.Chart({
    "chart": {
      "renderTo": "container",
      "type": "areaspline"
    },
    "plotOptions": {
      "series": {
//        "stacking": "normal",
        "pointInterval": 86400000,
        "pointStart": 1486252800000
      }
    },
    "series": [
      {
        "color": "#2B4058",
        "data": [null, 2, 1, 3, null],
        "name": "User A"
      },
      {
        "color": "#FF902A",
        "data": [null, null, 2, null, null],
        "name": "User B"
      }
    ],
    "xAxis": {
      "type": "datetime"
    }
  });
});