Hello,

After updating to React 15.0.1, we are getting the following error:

```
Uncaught TypeError: Cannot read property 'addEventListener' of null
```

![image](https://cloud.githubusercontent.com/assets/4996164/14602577/5bb4e9f2-0571-11e6-9aa1-98de49f50d76.png)

warning(
        !inst.contextTypes,
        'contextTypes was defined as an instance property on %s. Use a ' +
        'static property to define contextTypes instead.',
        this.getName() || 'a component'
      );
      warning(
        typeof inst.componentShouldUpdate !== 'function',
        '%s has a method called ' +
        'componentShouldUpdate(). Did you mean shouldComponentUpdate()? ' +
        'The name is phrased as a question because the function is ' +
        'expected to return a value.',
        (this.getName() || 'A component')
      );
      warning(
        typeof inst.componentDidUnmount !== 'function',
        '%s has a method called ' +
        'componentDidUnmount(). But there is no such lifecycle method. ' +
        'Did you mean componentWillUnmount()?',
        this.getName() || 'A component'
      );
      warning(
        typeof inst.componentWillRecieveProps !== 'function',
        '%s has a method called ' +
        'componentWillRecieveProps(). Did you mean componentWillReceiveProps()?',
        (this.getName() || 'A component')
      );
    }
    var initialState = inst.state;
    if (initialState === undefined) {