java.lang.IllegalStateException: The specified message queue synchronization barrier token has not been posted or has already been removed

Question

I am trying to access some SharedPreferences and inflate a Dialog on the mainUiThread inside activity's onCreate() method:

Here is some of my onCreate() method code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    new Handler(Looper.getMainLooper()).post(new Runnable() {

        @Override
        public void run() {
            // Access shared Prefs, then inflate a dialog using the 
            // LayoutInflater class
        }
    });
}

Why I did this? I noticed that the code I'm using to access the SharedPreferences then inflating a Dialog makes heavy load on the main Thread so I put it inside a Handler. I started to get this on Crashlytics:

Fatal Exception: java.lang.IllegalStateException: The specified message queue synchronization  barrier token has not been posted or has already been removed.
   at android.os.MessageQueue.removeSyncBarrier(MessageQueue.java:289)
   at android.os.Looper.removeSyncBarrier(Looper.java:275)
   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1054)
   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5996)
   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
   at android.view.Choreographer.doCallbacks(Choreographer.java:574)
   at android.view.Choreographer.doFrame(Choreographer.java:544)
   at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)
   at android.os.Handler.handleCallback(Handler.java:733)
   at android.os.Handler.dispatchMessage(Handler.java:95)
   at android.os.Looper.loop(Looper.java:136)
   at android.os.HandlerThread.run(HandlerThread.java:61)

Any idea?