App crashes while accessing MPNowPlayingInfoCenter().nowPlayingInfo

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func dynamicMediaInfo(playable: playableModelProtocol, playerItem: AVPlayerItem, player: AVPlayer) {     var dynamicInfo = nowPlayingCenter.nowPlayingInfo ?? [String: Any]()           let playerItemTotalDuration = CMTimeGetSeconds(playerItem.duration)     if playerItem.currentTime() != CMTime.indefinite,       playerItem.currentTime() != CMTime.invalid,       playerItem.currentTime() != CMTime.negativeInfinity,       playerItem.currentTime() != CMTime.positiveInfinity,       !playerItemTotalDuration.isNaN {       dynamicInfo[MPNowPlayingInfoPropertyElapsedPlaybackTime] = Float(CMTimeGetSeconds(playerItem.currentTime()))       dynamicInfo[MPMediaItemPropertyPlaybackDuration] = Float(playerItemTotalDuration)     }     dynamicInfo[MPNowPlayingInfoPropertyPlaybackRate] = player.rate     dynamicInfo[MPNowPlayingInfoPropertyDefaultPlaybackRate] = Constants.defaultRate     dynamicInfo[MPNowPlayingInfoPropertyCurrentLanguageOptions] = currentLangOption(playerItem: playerItem, playable: playable)     dynamicInfo[MPNowPlayingInfoPropertyAvailableLanguageOptions] = availableLanguageOptionGroups(playerItem: playerItem, playable: playable)     nowPlayingCenter.nowPlayingInfo = dynamicInfo   }

var dynamicInfo = nowPlayingCenter.nowPlayingInfo ?? [String: Any]() this line is crashed