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)

* @internal
   */
  construct: function(element) {
    this._currentElement = element;
    this._rootNodeID = null;
    this._instance = null;
    this._nativeParent = null;
    this._nativeContainerInfo = null;
    
    this._pendingElement = null;
    this._pendingStateQueue = null;
    this._pendingReplaceState = false;
    this._pendingForceUpdate = false;
    this._renderedNodeType = null;
    this._renderedComponent = null;
    this._context = null;
    this._mountOrder = 0;
    this._topLevelWrapper = null;
    
    this._pendingCallbacks = null;
    
    this._calledComponentWillUnmount = false;
  },
  /**
   * Initializes the component, renders markup, and registers event listeners.
   *
   * @param {ReactReconcileTransaction|ReactServerRenderingTransaction} transaction
   * @param {?object} nativeParent
   * @param {?object} nativeContainerInfo
   * @param {?object} context