Why does this code only work in studio but it doesn't work in Player? It's a LocalScript, too.

Edit: This code is for a button. I have found a problem in the code before asking this question, but fixing it didn't solve it. Code:

--// OldBo5 \\--
local frame = script.Parent.Parent.Parent.codeFrame
local txt = script.Parent.Parent.codeTxt
local btn = script.Parent
local plr = game.Players.LocalPlayer
btn.MouseButton1Down:Connect(function()
	if txt.Text == "testCode" and plr.hiddenleaderstats.redeemedCode1.Value == false then
		btn.Text = "Enjoy."
		plr.leaderstats.Cash.Value = plr.leaderstats.Cash.Value + 100
		plr.hiddenleaderstats.redeemedCode1.Value = true
		wait(2)
		btn.Text = "Redeem"
	elseif plr.hiddenleaderstats.redeemedCode1.Value == true then
		btn.Text = "Already redeemed"
		wait(2)
		btn.Text = "Redeem"
	end
end)

I have tried: Script Analysis. Replacing plr.hiddenleaderstats.redeemedCode1 with plr.hiddenleaderstats.redeemedCode1.Value (my fault for forgetting .Value)