[Issue] Core API on a Server Side Rendering React App

Hi, 

We use version 1.21.0 of the Core SDK on a React app which has Server Side Rendering (SSR). 
When rendering a page in SSR which uses your framework, we get the following error: 
```
        if (!window.cordova)
        ^
ReferenceError: window is not defined
```

In SSR, window isn't defined anyway.
Do you have a solution to get around this problem?

Thanks