When using ActiveWindow(), if you are out of focus from the Ultra Engine window, it will error

[scel5525pro2]

https://imgur.com/a/VRNjyQi
If its supposed to be like this, please tell me another way to fix this.

[Josh]

In your update function, you need to not execute that code if ActiveWindow returns nil. Something like this will work:

function Test:Update()
  local win = ActiveWindow()
  if win == nil then return end
  ---rest of your function here...
end