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)

context
    );
    if (internalInstance._currentElement &&
        internalInstance._currentElement.ref != null) {
      transaction.getReactMountReady().enqueue(attachRefs, internalInstance);
    }
    if (__DEV__) {
      if (internalInstance._debugID !== 0) {
        ReactInstrumentation.debugTool.onEndReconcilerTimer(
          internalInstance._debugID,
          'mountComponent'
        );
        ReactInstrumentation.debugTool.onMountComponent(
          internalInstance._debugID
        );
      }
    }
    return markup;
  },
  /**
   * Returns a value that can be passed to
   * ReactComponentEnvironment.replaceNodeWithMarkup.
   */
  getNativeNode: function(internalInstance) {
    return internalInstance.getNativeNode();
  },
  /**
   * Releases any resources allocated by `mountComponent`.
   *
   * @final