Why doesn't this data persistence script work?

I have a script that saves a player's leaderstats for how many kills that player has achieved. Here's the script:

game.Players.PlayerRemoving:connect(function(player)
    local s = player:findFirstChild("leaderstats")
    if s then
        local k = s:findFirstChild("Kills")
        player:SaveNumber("kill", k.Value)
    end
end)

game.Players.PlayerAdded:connect(function(player)
    if player:WaitForDataReady() then
        player:LoadNumber("kill")
    end
end)

The problem is that the script doesn't do anything. I tried putting print("check") in both lines of code and nothing showed up in the output. Any help?