How do you check the leaderstats of the player when they LEAVE?

I wanted to make a DataStore script that saves values when the player leave, but the problem is when they leave, their leaderstats is gone. Sometimes it works, sometimes it don't.

game.Players.PlayerRemoving:Connect(function(plr)
    local key = 'id-' ..plr.userId
    local stats = plr.leaderstats

    -- OVERWRITE THE CURRENT SAVETABLE --
    datastore:UpdateAsync(key, function(savetable)
        if savetable then
            local newtable = {stats.Money.Value}
            return newtable
        end
    end)
end)