Fix Crash :  NullPointerException at com.namelessdev.mpdroid.fragments.NowPlayingFragment$updateTrackInfoAsync.onPostExecute(NowPlayingFragment.java:571)

ERROR/AndroidRuntime(16477): FATAL EXCEPTION: main
        java.lang.NullPointerException
        at com.namelessdev.mpdroid.fragments.NowPlayingFragment$updateTrackInfoAsync.onPostExecute(NowPlayingFragment.java:571)
        at com.namelessdev.mpdroid.fragments.NowPlayingFragment$updateTrackInfoAsync.onPostExecute(NowPlayingFragment.java:528)
        at android.os.AsyncTask.finish(AsyncTask.java:631)
        at android.os.AsyncTask.access$600(AsyncTask.java:177)
        at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:5103)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:525)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
        at dalvik.system.NativeStart.main(Native Method)