Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.os.BaseBundle.getInt(java.lang.String)' on a null object reference

Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.os.BaseBundle.getInt(java.lang.String)' on a null object reference at com.github.ksoichiro.android.observablescrollview.a.restoreState(SourceFile:71) at android.support.v4.view.ViewPager.setAdapter(SourceFile:528) --------- at android.os.AsyncTask.finish(AsyncTask.java:660) at android.os.AsyncTask.-wrap1(AsyncTask.java) at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:677) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6162) at java.lang.reflect.Method.invoke(Method.java) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)