local DS = game:GetService("DataStoreService")
local InventoryStore = DS:GetDataStore("InventoryStore")
local function save(player)
	local playerInventory = player.Inventory:GetChildren()
	local playerSave = {}
	for i = 1, #playerInventory do
		print(playerInventory[i].Value)
		table.insert(playerSave, playerInventory[i].Value)
	end
	local success, failure = pcall(function()
		InventoryStore:SetAsync(player.UserId, playerSave)
	end)
	if success then
		print("Saving Success!")
	end
	if failure then
		warn("Critical Save failure. Data of "..player.Name.." not saved.")
	end
end
game.Players.PlayerAdded:Connect(function(player)
	local inventory = Instance.new("Folder", player)
	inventory.Name = "Inventory"
	Instance.new("StringValue", inventory).Value = "Test"
	local success, PlayerComputerTable = pcall(function()
		InventoryStore:GetAsync(player.UserId)
	end)
	if success then
		print(PlayerComputerTable)
	end
end)
game.Players.PlayerRemoving:Connect(function(playerRemoving)
	save(playerRemoving)
end)
game:BindToClose(function()
	for _, client in ipairs(game.Players:GetPlayers()) do
		coroutine.wrap(save)(client)
	end
end)

This code isn't erroring nor saving the Player's data.

Anonymous