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java.lang.NullPointerException at android.view.WindowId.equals(WindowId.java:168) at android.transition.Transition.pause(Transition.java:1669) at android.transition.TransitionSet.pause(TransitionSet.java:483) at android.transition.TransitionManager.sceneChangeSetup(TransitionManager.java:311) at android.transition.TransitionManager.beginDelayedTransition(TransitionManager.java:415) at android.support.v4.app.FragmentTransitionCompat21.beginDelayedTransition(FragmentTransitionCompat21.java:67) at android.support.v4.app.BackStackRecord.configureTransitions(BackStackRecord.java:1257) at android.support.v4.app.BackStackRecord.beginTransition(BackStackRecord.java:1077) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:678) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1671) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:532) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at org.robolectric.shadows.ShadowMessageQueue.dispatchMessage(ShadowMessageQueue.java:130) at org.robolectric.shadows.ShadowMessageQueue.access$100(ShadowMessageQueue.java:30) at org.robolectric.shadows.ShadowMessageQueue$1.run(ShadowMessageQueue.java:95) at org.robolectric.util.Scheduler.runOrQueueRunnable(Scheduler.java:230) at org.robolectric.util.Scheduler.postDelayed(Scheduler.java:85) at org.robolectric.shadows.ShadowMessageQueue.enqueueMessage(ShadowMessageQueue.java:116) at android.os.MessageQueue.enqueueMessage(MessageQueue.java) at android.os.Handler.enqueueMessage(Handler.java:631) at android.os.Handler.sendMessageAtTime(Handler.java:600) at android.os.Handler.sendMessageDelayed(Handler.java:570) at android.os.Handler.post(Handler.java:326) at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1557) at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:654) at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:621)