Killing Input Dialog Activity is giving run time error

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Hi everyone, I am trying to build a weather bot where user would enter city name & get weather details of the respective city but the problem is if the input dialog box is closed or left blank, the entire process still runs typing a blank city name in the browser.
I have tried to handle this empty input case in if block using Close Application, Close Window & Kill Process activity, but every time I get a run time error.

Source: Close Application
Message: Value does not fall within the expected range.
Exception Type: System.ArgumentException
RemoteException wrapping System.ArgumentException: Value does not fall within the expected range.