Swift addTarget does not get removed?

The target of nextTrackCommand is called multiple times when I navigate back from a screen and enter the screen again even tho i remove the target in viewWillDisappear. What did I do wrong?

override func viewDidLoad() {
    super.viewDidLoad()

    UIApplication.shared.beginReceivingRemoteControlEvents()

    MPRemoteCommandCenter.shared().nextTrackCommand.addTarget { [unowned self] (_) -> MPRemoteCommandHandlerStatus in
        print("go to next track")
        return .success
    }
}

override func viewWillDisappear(_ animated: Bool) {
    MPRemoteCommandCenter.shared().nextTrackCommand.removeTarget(self)
}

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