Control Center's progress view does not pause

Question

I've set up control center for my AVAudioPlayer. Everything works great, except for the progress bar in control center, which continues counting up whenever the AVAudioPlayer is paused. How can I fix this? Here's what I have so far:

    func updateNowPlayingCenter (title: String, artist: String, currentTime: AnyObject, songLength: AnyObject, PlaybackRate: Double){

            let image:UIImage = UIImage(named: title)!
            let artwork = MPMediaItemArtwork.init(boundsSize: image.size, requestHandler: { (size) -> UIImage in
                return image
            })


            var songInfo: Dictionary <NSObject, AnyObject> = [

                MPMediaItemPropertyTitle as NSObject: title as AnyObject,

                MPMediaItemPropertyArtist as NSObject: artist as AnyObject,

                MPMediaItemPropertyArtwork as NSObject: artwork,

                MPNowPlayingInfoPropertyElapsedPlaybackTime as NSObject: currentTime,

                MPMediaItemPropertyPlaybackDuration as NSObject: songLength,

                MPNowPlayingInfoPropertyPlaybackRate as NSObject: PlaybackRate as AnyObject



            ]


            MPNowPlayingInfoCenter.default().nowPlayingInfo = songInfo as [NSObject : AnyObject] as! [String : Any]

        }

override func remoteControlReceived(with event: UIEvent?) {
        if event?.type == UIEventType.remoteControl {
            if event?.subtype == UIEventSubtype.remoteControlPlay {
                audioPlayer.play()
            } else if event?.subtype == UIEventSubtype.remoteControlPause {
                audioPlayer.pause
            } else if event?.subtype == UIEventSubtype.remoteControlNextTrack {
                nextButtonTapped()
            } else if event?.subtype == UIEventSubtype.remoteControlPreviousTrack {
                previousButtonTapped()
            }
        }
    }

and in the viewDidLoad:

updateNowPlayingCenter(title: titleText[thisSong], artist: authorText[thisSong], currentTime: audioPlayer.currentTime as AnyObject, songLength: audioPlayer.duration as AnyObject, PlaybackRate: 1.0)

I'm using Swift 3 and Xcode 8.