NPE getActionBarHeight (r.tvbarthel.blurdialogfragment:lib:2.2.0)

[WagesOfSin]

Android: 6.0.1
Android Build: MMB29M.J500HXXU2BQC4
Manufacturer: samsung
Model: SM-J500H
Thread: AsyncTask #3-11668
CrashReporter Key: 5DCDAADF-0C2A-ABFB-EA2E-94F387C25DA58E36B076
Start Date: Fri Jul 28 15:12:07 GMT+03:00 2017
Date: Sat Jul 29 00:34:44 GMT+03:00 2017

java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:309)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActionBar android.app.Activity.getActionBar()' on a null object reference
at fr.tvbarthel.lib.blurdialogfragment.BlurDialogEngine.getActionBarHeight(BlurDialogEngine.java:471)
at fr.tvbarthel.lib.blurdialogfragment.BlurDialogEngine.blur(BlurDialogEngine.java:344)
at fr.tvbarthel.lib.blurdialogfragment.BlurDialogEngine.access$400(BlurDialogEngine.java:42)
at fr.tvbarthel.lib.blurdialogfragment.BlurDialogEngine$BlurAsyncTask.doInBackground(BlurDialogEngine.java:593)
at fr.tvbarthel.lib.blurdialogfragment.BlurDialogEngine$BlurAsyncTask.doInBackground(BlurDialogEngine.java:550)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
... 4 more