Failed to execute 'insertBefore' on 'Node'

[nickmealey]

When using the insertHtml method, this error seems to come up. Adding another definition to Medium.Html seems to fix the problem:

Medium.Html = function (medium, html) {
  this.medium = medium;
  this.element = medium.settings.element;
  this.html = html; // Adding this line fixes the error
  this.clean = true;
};