Script won't stop adding trees - how to stop?

So this code is a plugin, which adds trees at the mouse's location. When I click to stop, it does not work. Here is the code:

-- Create a new toolbar section titled "Custom Script Tools"
open =  false
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local toolbar = plugin:CreateToolbar("Custom Script Tools")
local ChangeHistoryService = game:GetService("ChangeHistoryService")

 
-- Add a toolbar button named "Create Empty Script"
local newScriptButton = toolbar:CreateButton("Create Snow Tree", "Create a Snow Tree", "rbxassetid://4458901886")

local function onNewScriptButtonClicked()
	if open == false then
		open = true
		print("Awesomemode14 Plugin is Open")
		local folder = Instance.new("Folder")
		folder.Parent = game:GetService("Workspace")
		folder.Name = "Snow Trees"
		mouse.Button1Down:Connect(function()
			local tree = game.ReplicatedStorage:WaitForChild("SnowTree")
			local treeClone = tree:Clone()
			treeClone.Parent = folder--game:GetService("Workspace")
			treeClone:SetPrimaryPartCFrame(CFrame.new(mouse.Hit.X, 15.855, mouse.Hit.Z))
			ChangeHistoryService:SetWaypoint("Added new tree")			
		end)		
	else 
		open = false
		mouse.Button1Up:Connect(function()end)
		print("Awesomemode14 Plugin was Closed")			
	end	
end
newScriptButton.Click:Connect(onNewScriptButtonClicked)

Thanks for the Help!