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)

_batchingStrategy,
      'ReactUpdates: must provide a batching strategy'
    );
    invariant(
      typeof _batchingStrategy.batchedUpdates === 'function',
      'ReactUpdates: must provide a batchedUpdates() function'
    );
    invariant(
      typeof _batchingStrategy.isBatchingUpdates === 'boolean',
      'ReactUpdates: must provide an isBatchingUpdates boolean attribute'
    );
    batchingStrategy = _batchingStrategy;
  },
};
var ReactUpdates = {
  /**
   * React references `ReactReconcileTransaction` using this property in order
   * to allow dependency injection.
   *
   * @internal
   */
  ReactReconcileTransaction: null,
  batchedUpdates: batchedUpdates,
  enqueueUpdate: enqueueUpdate,
  flushBatchedUpdates: flushBatchedUpdates,
  injection: ReactUpdatesInjection,
  asap: asap,
};
module.exports = ReactUpdates;