Why is Filter Enabled causing problems to my game?

I have just turned on filter enabled for my game. But this script isn't working anymore.

Here is the script.

script.Parent.DialogChoiceSelected:connect(function(player,dialog)
 local gui = script.Parent.ScreenGui2 
 if dialog.Name=="Choice2" then
  gui:Clone().Parent = player.PlayerGui
 end
end)

If anyone reads this, please help me out. I'd also appreciate it if you'd explain why scripts disable like that when filter enabled is turned on.