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java.lang.NullPointerException: 	at cz.savrov.app.utils.RootActivity.onBackPressed(RootActivity.java:111)	at android.app.Activity.onKeyUp(Activity.java:2227)	at android.view.KeyEvent.dispatch(KeyEvent.java:2706)	at android.app.Activity.dispatchKeyEvent(Activity.java:2464)	at android.support.v7.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:534)	at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:50)	at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.dispatchKeyEvent(AppCompatDelegateImplBase.java:241)	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2014)	at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:4287)	at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4255)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3809)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3859)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3828)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3935)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3836)	at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3992)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3809)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3859)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3828)	at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3836)	at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3809)	at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3859)	at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3828)	at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3968)	at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:4137)	at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:2089)	at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:1766)	at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:1757)	at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:2066)	at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:141)	at android.os.MessageQueue.nativePollOnce(Native Method)	at android.os.MessageQueue.next(MessageQueue.java:138)	at android.os.Looper.loop(Looper.java:150)	at android.app.ActivityThread.main(ActivityThread.java:5395)	at java.lang.reflect.Method.invokeNative(Native Method)	at java.lang.reflect.Method.invoke(Method.java:515)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:837)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:653)	at dalvik.system.NativeStart.main(Native Method)