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)

/**
   * Initializes the component, renders markup, and registers event listeners.
   *
   * @param {ReactComponent} internalInstance
   * @param {ReactReconcileTransaction|ReactServerRenderingTransaction} transaction
   * @param {?object} the containing native component instance
   * @param {?object} info about the native container
   * @return {?string} Rendered markup to be inserted into the DOM.
   * @final
   * @internal
   */
  mountComponent: function(
    internalInstance,
    transaction,
    nativeParent,
    nativeContainerInfo,
    context
  ) {
    if (__DEV__) {
      if (internalInstance._debugID !== 0) {
        ReactInstrumentation.debugTool.onBeginReconcilerTimer(
          internalInstance._debugID,
          'mountComponent'
        );
      }
    }
    var markup = internalInstance.mountComponent(
      transaction,
      nativeParent,
      nativeContainerInfo,