Roblox studio write error in DataStore when i use GetAsync?

Hello, i wants to make obby with leaderstats("stage"). I make it and open in settings API request, but it write error

ServerScriptService.Script:12: attempt to index nil with 'Stage'

I dont know how to fix it. What to do? My code:

local DSS = game:GetService("DataStoreService")
local DataStore = DSS:GetDataStore("DataStore")

game.Players.PlayerAdded:Connect(function(plr)
    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = plr

    local stage = Instance.new("IntValue")
    stage.Name = "Stage"
    stage.Parent = leaderstats
    stage.Value = DataStore:GetAsync(plr.UserId).Stage or 1
end)

game.Players.PlayerRemoving:Connect(function(plr)
    DataStore:SetAsync(plr.UserId, {
        ["Stage"] = plr.leaderstats.Stage.Value
    })
end)