Version: **15.0.0-rc.1**
Fiddle: https://jsfiddle.net/69z2wepo/33980/ (check console)

For an example providing `NaN` to a css property will result in "_NaN is an invalid value for the fontSize css style property_".
Now I'm aware that there is an error in my code but I have no idea which component I should check.
I would like to have something like this: "_NaN is an invalid value for the fontSize style property. Check the render method of Header_".
I'll be happy to try to solve this if this is something we want to do.

});
  describe('unmountComponent', function() {
    it('should clean up listeners', function() {
      var EventPluginHub = require('EventPluginHub');
      var ReactDOMComponentTree = require('ReactDOMComponentTree');
      var container = document.createElement('div');
      document.body.appendChild(container);
      var callback = function() {};
      var instance = <div onClick={callback} />;
      instance = ReactDOM.render(instance, container);
      var rootNode = ReactDOM.findDOMNode(instance);
      var inst = ReactDOMComponentTree.getInstanceFromNode(rootNode);
      expect(
        EventPluginHub.getListener(inst, 'onClick')
      ).toBe(callback);
      expect(rootNode).toBe(ReactDOM.findDOMNode(instance));
      ReactDOM.unmountComponentAtNode(container);
      expect(
        EventPluginHub.getListener(inst, 'onClick')
      ).toBe(undefined);
    });
    it('unmounts children before unsetting DOM node info', function() {
      var Inner = React.createClass({
        render: function() {
          return <span />;
        },
        componentWillUnmount: function() {
          
          expect(ReactDOM.findDOMNode(this).nodeName).toBe('SPAN');
        },