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)

inst.updater = ReactUpdateQueue;
    this._instance = inst;
    
    ReactInstanceMap.set(inst, this);
    if (__DEV__) {
      
      
      
      warning(
        !inst.getInitialState ||
        inst.getInitialState.isReactClassApproved,
        'getInitialState was defined on %s, a plain JavaScript class. ' +
        'This is only supported for classes created using React.createClass. ' +
        'Did you mean to define a state property instead?',
        this.getName() || 'a component'
      );
      warning(
        !inst.getDefaultProps ||
        inst.getDefaultProps.isReactClassApproved,
        'getDefaultProps was defined on %s, a plain JavaScript class. ' +
        'This is only supported for classes created using React.createClass. ' +
        'Use a static property to define defaultProps instead.',
        this.getName() || 'a component'
      );
      warning(
        !inst.propTypes,
        'propTypes was defined as an instance property on %s. Use a static ' +
        'property to define propTypes instead.',
        this.getName() || 'a component'
      );