How do I fix the error: "attempt to index local 'Player' (a nil value)"?

function click()
	local stick = script.Parent
	local Player = game.Players.LocalPlayer
	repeat wait(.01) until Player:FindFirstChild("PlayerGui")
	wait(.1)
	stick.Transparency = 1
	stick.CanCollide = false
	stick.ClickDetector.MaxActivationDistance = 0
	
	local num = Player.PlayerGui.ScreenGui.Frame.rockSec.num.Text
	Player.PlayerGui.ScreenGui.Frame.rockSec.num.Text = num + 1
	
	
end

script.Parent.ClickDetector.MouseClick:connect(click)

I have a rock and I when I click the rock I want it to add 1 to the 'PlayerGui.ScreenGui.Frame.rockSec.num.Text'. When I run this in studio it works fine. When I run it in an actual game I get the error like:

"Workspace.Rock.rockClicked:6: attempt to index local 'Player' (a nil value)"

I'm confused about how to fix this because it works fine in Roblox Studio.