Libgdx - 当我使用.isPressed（）时stackOverFlow

I'm coding a Menu using the latest version of Libgdx. Each screen (MainMenuScreen, OptionsMenuScreen, CreditsMenuScreen) contains some buttons. Each button should change the screen. If I'm on MainMenuScreen and I press "credits", I get the CreeditsMenuScreen. But when I use "back button" to get back in the Main Menu, I get a stackOverflow error. I'm coding a Menu using the latest version of L