A bug for Picture In Picture when back to home screen

[Kimentanm]

When I open Background Mode in Xcode and back to home screen, The Picture In Picture will disappear quickly.
And when i annotation this line code，it works
Please fix, thanks

    /**
      detach player UI to keep audio playing in background
     */
    func applicationDidEnterBackground(_ application: UIApplication) {
       // self.playerViewController?.player = nil
    }

[KhuramKhalid]

Fixed in 2.0.2-rc2