My script doesn't seem to be working?

This is supposed to add money to the money int value in the leaderstats when it touched the brick at the end of my tycoon thingy. It was working, but not anymore? Any ideas?

game.Players.PlayerAdded:connect(function(player)
	local leaderstats = Instance.new("Model",player)
	leaderstats.Name = "leaderstats"
    local money = Instance.new("IntValue", leaderstats)
	money.Name = "Money"
	money.Value = 0
function addMoney(b)
	if b.Name == "MONEYBRICK" then
		money.Value = money.Value + 5
		if game.Workspace.UPGRADE1.Touched and b.Name == "MONEYBRICK" then
		money.Value = money.Value + 5
		end
	end
end
function buyupgrade1()
	if money.Value >= 50 then
		money.Value = money.Value - 50
	c = game.Lighting.UPGRADE1:Clone()
	wait(.5)
	c.Parent = game.Workspace
	game.Workspace.pp:Destroy()
	c.Transparency = 0.7
	wait(1)
	c.Transparency = 0.5
	wait(1)
	c.Transparency = 0.3
	wait(1)
	c.Transparency = 0 
	end
end
end)
game.Workspace.pp.Touched:connect(buyupgrade1)
game.Workspace.HITPART.Touched:connect(addMoney)

Try this. If it works, I'll explain it.

game.Players.PlayerAdded:connect(function(player)
    local leaderstats = Instance.new("IntValue",player)
    leaderstats.Name = "leaderstats"
    local money = Instance.new("IntValue", leaderstats)
    money.Name = "Money"
    money.Value = 0
end)

function addMoney(b)
    if b.Name == "MONEYBRICK" then --Is "b" a nil variable
        money.Value = money.Value + 5
        if game.Workspace.UPGRADE1.Touched and b.Name == "MONEYBRICK" then
        money.Value = money.Value + 5
        end
    end
end
function buyupgrade1()
    if money.Value >= 50 then
        money.Value = money.Value - 50
local c = game.Lighting.UPGRADE1:Clone()
    wait(.5)
    c.Parent = game.Workspace
    game.Workspace.pp:Destroy()
    c.Transparency = 0.7
    wait(1)
    c.Transparency = 0.5
    wait(1)
    c.Transparency = 0.3
    wait(1)
    c.Transparency = 0 
    end
end

game.Workspace.pp.Touched:connect(buyupgrade1)
game.Workspace.HITPART.Touched:connect(addMoney)

Thanks for everyones reponses, I got the problem fixed by removing some of the code from the main function. Lots of lessons learned here :P