Runtime Error Bug

I get This Error When I Try To Exit App. Can Anybody Suggest Me Fix For It

Make sure you switch screens correct

When I am on screen 1 then back button work.but when I go to screen 2 and comeback to screen 1 then this error shows

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Yeah because Iam sure you did not close screen 2/ or open screen 1 correct…

Screen1 is working perfectly but when I visit screen2 and come back and press back button then this show runtime error

Read what I wrote…
The problem is you dont switch screens correct…
Search on Google for switch Ing screens correct in App Inventor…

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