Was there a recent update that would have caused this script to stop working?

So this script is part of a Crafting GUI and recently (probably after an update) I noticed the script stopped working while in play mode. The script is in a button and makes another GUI object appear when the button is clicked but for some reason nothing happens when its clicked in play mode. It works perfectly fine in edit test mode, and IS in a local script. Anyone have any idea of what happened?

Sidenote: Also, I had a similar script to open a different GUI and it wasn't working either, so I removed the for ..... do function part and it started working so I'm pretty sure it has to do with that part of the script. Thanks for any help!

local player = game.Players.LocalPlayer

local BUTTON = script.Parent
local FRAME = BUTTON.Parent.Parent.ScrollingFrame1


FRAME.Visible = false

--------------------------------------------------


function onMouseButton1Down(mouse)
	local SBUTTONS = BUTTON.Parent.Parent:GetChildren()
	local NAME = BUTTON.Name
	
	FRAME.Visible = true
	
	for index, child in pairs(SBUTTONS) do
		if child.Name ~= NAME and child.Name ~= "SelectBar" 
			then child.Visible = false
			
		end
		
	end
end

BUTTON.MouseButton1Down:connect(onMouseButton1Down)