NPE in downloadmanager is handled

        downloadFile: File,

        downloadCompleted: ((Boolean, String) -> Unit)?

    ): Long {

        var downloadId = -1L

        try {

            val request = DownloadManager.Request(Uri.parse(url))

                .setTitle("Downloading...")

                .setDestinationUri(Uri.fromFile(downloadFile))

        val downloadId = downloadManager.enqueue(request)

            downloadId = downloadManager.enqueue(request)

        } catch (e: java.lang.NullPointerException) {

            Timber.e(e, "Url: $url; downloadFilePath: ${downloadFile.absolutePath}")

            downloadCompleted?.invoke(false, e.localizedMessage ?: "No message found!")

            return downloadId

        }

        downloadsMaps[downloadId] = true

        tickerFlow(downloadId, .5.seconds).onEach {

            checkDownloadProgress(downloadId, downloadFile.absolutePath, downloadCompleted)