title: highcharts always console error ablout bubble_compiled.js?
body: <p>I write a pie chart in my app<br>
  But it always error with <code>bubble_compiled.js</code><br>
  when I click in pie, it don't has animate,
  and it show <code>Uncaught TypeError: a.target.className.indexOf is not a function</code>
  Why?</p>