DownloadTaskManager.getRunningDownloadTask NPE

[veritas1]

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
       at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:772)
       at org.wlf.filedownloader.file_download.DownloadTaskManager.getRunningDownloadTask(DownloadTaskManager.java:183)
       at org.wlf.filedownloader.file_download.DownloadTaskManager.getRunningDownloadTask(DownloadTaskManager.java:166)
       at org.wlf.filedownloader.file_download.DownloadTaskManager.isDownloading(DownloadTaskManager.java:836)
       at org.wlf.filedownloader.file_download.DownloadTaskManager.notifyDownloadStatusFailed(DownloadTaskManager.java:434)
       at org.wlf.filedownloader.file_download.DownloadTaskManager.access$500(DownloadTaskManager.java:45)
       at org.wlf.filedownloader.file_download.DownloadTaskManager$5.onDetectUrlFileFailed(DownloadTaskManager.java:736)
       at org.wlf.filedownloader.listener.OnDetectBigUrlFileListener$MainThreadHelper$3.run(OnDetectBigUrlFileListener.java:114)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5551)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)