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)

'%s: %s type `%s` is invalid; it must be a function, usually ' +
            'from React.PropTypes.',
            componentName || 'React class',
            ReactPropTypeLocationNames[location],
            propName
          );
          error = propTypes[propName](props, propName, componentName, location);
        } catch (ex) {
          error = ex;
        }
        if (error instanceof Error) {
          
          
          
          var addendum = getDeclarationErrorAddendum(this);
          if (location === ReactPropTypeLocations.prop) {
            
            warning(
              false,
              'Failed Composite propType: %s%s',
              error.message,
              addendum
            );
          } else {
            warning(
              false,
              'Failed Context Types: %s%s',
              error.message,
              addendum
            );