I got the crash on Crashlytics of Fabric only for iOS 13 users when the NavigationBar of the particular ViewController is being hidden.

I tried by hiding the NavigationBar for particular ViewController by using NavigationController's delegate method

```
func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
    let hide = (viewController is MyVC)
    navigationController.setNavigationBarHidden(hide, animated: animated)
}

```

But it also generating the crash on crashlytics called

```
Fatal Exception: NSInternalInconsistencyException

threading violation: expected the main thread

```