java.lang.RuntimeException: Unable to stop activity: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.unFocus(android.view.View)' on a null object reference

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java.lang.RuntimeException: Unable to stop activity: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.unFocus(android.view.View)' on a null object reference
at android.view.ViewGroup.removeViewInternal(ViewGroup.java:4937)
at android.view.ViewGroup.removeViewAt(ViewGroup.java:4899)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1535)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1585)
at android.support.v4.app.FragmentManagerImpl.dispatchStop(FragmentManager.java:2855)
at android.support.v4.app.FragmentController.dispatchStop(FragmentController.java:245)
at android.support.v4.app.FragmentActivity.onStop(FragmentActivity.java:627)
at android.app.Instrumentation.callActivityOnStop(Instrumentation.java:1306)
at android.app.Activity.performStop(Activity.java:7070)
at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:4707)
at android.app.ActivityThread.handleStopActivity(ActivityThread.java:4774)
at android.app.ActivityThread.access$1400(ActivityThread.java:222)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1824)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7229)

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