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)

log.push('asap-1.1');
          }, this);
        } else if (this.state.updates === 2) {
          ReactUpdates.asap(function() {
            log.push('asap-2');
          });
        }
        log.push('didUpdate-' + this.state.updates);
      },
    });
    var component = ReactTestUtils.renderIntoDocument(<A />);
    component.setState({updates: 1});
    expect(log).toEqual([
      'render-0',
      
      'render-1',
      'didUpdate-1',
      
      'asap-1.1',
      
      'render-2',
      'didUpdate-2',
      
      
      'setState-cb',
      'asap-2',
      'asap-1.2',
    ]);
  });
  it('does not call render after a component as been deleted', function() {