What is the reason this script isn't working, it might be to do with the player variable?

RealMoney isn't in leaderstats This script is for when the zombie dies money is given to the player, however it is a 1 man server.

local zombie = game.Workspace:FindFirstChild("Zombie")
local player = game.Players.LocalPlayer

if zombie.Humanoid.Health <= 0 then
	do player.RealMoney.Value = player.RealMoney.Value + 9999999
end