The code

``` javascript
class Comp extends React.Component {
  componentWillMount() {
    setTimeout(() => {
      this.setState({});
    });
  }

  render() {
    return <div onClick={() => {}} />;
  }
}

ReactDOMServer.renderToString(<Comp />);
```

produces errors:

> Warning: React can't find the root component node for data-reactid value `.0`. If you're seeing this message, it probably means that you've loaded two copies of React on the page. At this time, only a single copy of React can be loaded at a time.
> 
> Uncaught TypeError: Cannot read property 'firstChild' of undefined

But if I remove `onClick` handler the errors go away...

See demo: http://codepen.io/dened/pen/YyByYr

componentWillUpdate: function() {
            lifecycle.push('componentWillUpdate');
          },
          componentDidUpdate: function() {
            lifecycle.push('componentDidUpdate');
          },
          shouldComponentUpdate: function() {
            lifecycle.push('shouldComponentUpdate');
          },
          componentWillReceiveProps: function() {
            lifecycle.push('componentWillReceiveProps');
          },
          componentWillUnmount: function() {
            lifecycle.push('componentWillUnmount');
          },
        });
        var response = ReactServerRendering.renderToStaticMarkup(
          <TestComponent />
        );
        expect(response).toBe('<span>Component name: TestComponent</span>');
        expect(lifecycle).toEqual(
          ['getInitialState', 'componentWillMount', 'render']
        );
      }
      runTest();
      
      ExecutionEnvironment.canUseDOM = true;
      runTest();
    });
    it('should throw with silly args', function() {