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)

this._debugID,
            'componentWillMount'
          );
        }
      }
      inst.componentWillMount();
      if (__DEV__) {
        if (this._debugID !== 0) {
          ReactInstrumentation.debugTool.onEndLifeCycleTimer(
            this._debugID,
            'componentWillMount'
          );
        }
      }
      
      
      if (this._pendingStateQueue) {
        inst.state = this._processPendingState(inst.props, inst.context);
      }
    }
    
    if (renderedElement === undefined) {
      renderedElement = this._renderValidatedComponent();
    }
    this._renderedNodeType = ReactNodeTypes.getType(renderedElement);
    this._renderedComponent = this._instantiateReactComponent(
      renderedElement
    );
    var markup = ReactReconciler.mountComponent(
      this._renderedComponent,