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java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState	at android.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1330)	at android.app.FragmentManagerImpl.popBackStackImmediate(FragmentManager.java:497)	at android.app.Activity.onBackPressed(Activity.java:2485)	at android.app.Activity.onKeyUp(Activity.java:2459)	at android.view.KeyEvent.dispatch(KeyEvent.java:2631)	at android.app.Activity.dispatchKeyEvent(Activity.java:2710)	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2224)	at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:3961)	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3923)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3487)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3540)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3506)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3616)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3514)	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3673)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3487)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3540)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3506)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3514)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3487)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3540)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3506)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3649)	at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:3815)	at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2227)	at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1868)	at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1859)	at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2204)	at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)	at android.os.MessageQueue.nativePollOnce(Native Method)	at android.os.MessageQueue.next(MessageQueue.java:143)	at android.os.Looper.loop(Looper.java:122)	at android.app.ActivityThread.main(ActivityThread.java:5238)	at java.lang.reflect.Method.invoke(Native Method)	at java.lang.reflect.Method.invoke(Method.java:372)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:906)