Load Data Store Table But Got Nil

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#1

im trying to save table in data store
but some of table is nil after loading

im trying to data store table in table that in table
but some of table is nil

when saving

output
▼  {
                    ["1"] =  ▼  {
                       ["16"] =  ▼  {
                          ["Pixel10x1"] = 1, 1, 1,
                          ["Pixel10x10"] = 1, 1, 1,
                          ["Pixel10x11"] = 1, 1, 1,

when loading


output
 ▼  {
                    ["1"] =  ▼  {
                       ["16"] = {}

and when i try to save only 1 table

output
{}

im not sure if my code is wrong but here

local DS = game:GetService("DataStoreService")
local HS = game:GetService("HttpService")
local Data_Key = 0
local ArtData = DS:GetDataStore("ArtData"..Data_Key)

game.ReplicatedStorage.Event.ArtDataEvent.OnServerEvent:Connect(function(Player, ArtDataStore)
	print(ArtDataStore)
	local UserID = Player.UserId
	ArtData:SetAsync(UserID,HS:JSONEncode(ArtDataStore))
end)

game.Players.PlayerAdded:Connect(function(Player)
	local UserID = Player.UserId
	local ArtDataGet = ArtData:GetAsync(UserID)
	local ArtData = HS:JSONDecode(ArtDataGet)
	print(ArtData)
end)