Attempt to index nil with leaderstats? (HELP)

So my code for a keycard wont work can anyone help?

local rs = game:WaitForChild("ReplicatedStorage")
local fa = rs.AccessCards.FullAccess
local leaderstats = game.Players.LocalPlayer.leaderstats --could be the problem
game.Players.PlayerAdded:Connect(function(player)
	if leaderstats.Rank.Value == ("Dev.. Mayor Chill") then -- could also be the problem
		local clone = fa:Clone()
		clone.Parent = player.Backpack
	end
end)

I think I got it. LocalPlayer doesn't load in for a long time, instead use player.leaderstats where checking for a rank. Hopefully it works, otherwise add in a 0.2 second delay to let it all load in!

ive got a new code but now its indexing nil with Backpack

local rs = game:WaitForChild("ReplicatedStorage")
local fa = rs.AccessCards.FullAccess
game.Players.PlayerAdded:Connect(function(player)
	wait(0.2)
	local leaderstats = player:WaitForChild("leaderstats")
	local players = game.Players.LocalPlayer
	local backpack = players.BackPack
	if leaderstats.Rank.Value == ("Dev") then
		local clone = fa:Clone()
		clone.Parent = backpack
	end
end)