CLPlacemark crash in Swift

I'm using CLGeocoder for reverse geolocation and get array of CLPlacemark. When I use GPS outside the US (i.e. -27,127) and then access placemark.postalCode, the app crashes with:

"fatal error: unexpectedly found nil while unwrapping an Optional value".

It seems, that placemark.postalCode is nil where no postal code is available. But postalCode return type in Swift is String!:

var postalCode: String! { get } // zip code, eg. 95014

So I can't even test is for nil, because the crash is caused by the getter of postalCode.

Any ideas how to prevent this crash? Thank you!

Being an optional, even if implicitly unwrapped, you can check it for nil:

if placemark.postalCode != nil {

}

and the app won't crash because of that :)

To prove it, just try this code in a playground, where 2 implicitly unwrapped properties (a computed and a stored) are checked for nil:

struct Test {
    var nilComputed: String! { return nil }
    var nilStored: String! = nil
}

var test = Test()

if test.nilComputed != nil {
    print("It's not nil")
} else {
    print("It's nil")
}

if test.nilStored != nil {
    print("It's not nil")
} else {
    print("It's nil")
}