auto updater fc sometimes

[xuiqzy]

09-20 14:03:48.820 29175-29211/de.adornis.Notifier E/ADORNIS﹕ online: 1411211665, offline: 1411211662
09-20 14:03:50.600 29175-29191/de.adornis.Notifier W/ContextImpl﹕ Failed to ensure directory: /storage/emulated/0/Android/data/de.adornis.Notifier/cache
09-20 14:03:50.610 29175-29191/de.adornis.Notifier W/dalvikvm﹕ threadid=11: thread exiting with uncaught exception (group=0x416e2ce0)
09-20 14:03:50.615 29175-29191/de.adornis.Notifier E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #\1
Process: de.adornis.Notifier, PID: 29175
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.NullPointerException
at de.adornis.Notifier.AutoUpdater$1.doInBackground(AutoUpdater.java:70)
at de.adornis.Notifier.AutoUpdater$1.doInBackground(AutoUpdater.java:56)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)