"Received data was not a string, or was not a recognised encoding."

It seems to be getting picked up by google analytics but I'm getting this warning. Any idea why?

I'm running ios version 9.2 and this is how I'm calling it.

``` javascript
    let screenView = new GAHits.ScreenView(
      config.app.name,
      screenName,
      config.app.version,
      config.app.id,
      null,
      null
    );
```
