unity game crashes if I press home button on game circle layout screen

I've made a game on unity and added amazon game circle leaderboard in it. My leaderboard works fine but if I press android home button while on leaderboard screen and then reopen y app after opening some other applications my game crashes...

A workaround that I found was to quit application if home button is pressed so that it always starts from splash screen and don't crash... but then I don't know how to access home button for abdroid