Crash when hooking NSURL

[623637646]

let object = NSURL.init(string: "https://www.google.com")!
let hook = try? object.hook(
    #selector(getter: NSURL.host),
    methodSignature: (@convention(c) (AnyObject, Selector) -> String).self,
    hookSignature: (@convention(block) (AnyObject) -> String).self) { store in { `self` in
    return "http://www.facebook.com"
        }
}
let host = object.host

it's similar with this issue. steipete/Aspects#177