exit loop and close app

hi guys, just bought the lifetime pro version and am loving it. 

I would like to know if there is a way to close an app and exit the if(true) do loop if it recognises a specific image (run out of stamina page).

Here is my loop

while (true) do

  if exists("useitemLD.jpg") then

  click(Location(558, 872))

  wait(2)

  --click start

  existsClick("startLD.jpg", 2)

  existsClick("startLD.jpg", 2)

  end

  if exists("close.jpg") then

  click(Location(899, 1859))

  existsClick("summonnightmare.jpg", 1)

  existsClick("summonnightmare_lowres.jpg", 1)

  existsClick("summonnightmare_highres.jpg", 1)

  end

  if exists("expearnedLD.jpg", 1) then

  wait(1)

  setContinueClickTiming(10,50)

  continueClick(541,1977,1,1,14)

  end



  if exists("connectionfailed.jpg") then

  existsClick("ok.jpg", 1)

  end



  existsClick("update.jpg", 1)


  <recognise "no more ap" and close app + end loop>

end

would be cool if i could get some advice, thanks