Devforum inventory datastore script not working?

Hey, so my datastore script for saving inventories isn't working at all. I checked the console, and it didn't print any errors..

local Players = game:GetService("Players")
local DataStoreService = game:GetService("DataStoreService")
local ServerStorage = game:GetService("ServerStorage")

local player_data = DataStoreService:GetDataStore("player_data")
local cash_data = DataStoreService:GetDataStore("cash_store")

local tools = ServerStorage.Tools
local inventories = ServerStorage.Inventories

Players.PlayerAdded:Connect(function(client)
    local key = "client_" .. client.UserId
    local success, inventory = pcall(function()
        return player_data:GetAsync(key)
    end)

    local inventory_folder = Instance.new("Folder")
    inventory_folder.Name = client.Name
    inventory_folder.Parent = inventories

    for _, name in ipairs(inventory or { }) do
        local tool = tools[name]
        tool:Clone().Parent = client.Backpack -- For the player to use
        tool:Clone().Parent = inventory_folder -- For saving and loading
    end
end)

Players.PlayerRemoving:Connect(function(client)
    local key = "client_" .. client.UserId
    local tools = { }
    local inventory_folder = inventories[client.Name]

    for _, item in ipairs(inventory_folder:GetChildren()) do
        table.insert(tools, item.Name)
    end

    local success, err = pcall(function()
        player_data:UpdateAsync(key, function(prev)
            return tools
        end)
    end)

    if not success then
        warn(err)
    end

    inventory_folder:Destroy()
end)

I found the script off the devforum https://devforum.roblox.com/t/how-to-save-your-players-inventory-items/467961

EDIT: After some messing around with the code, I've figured that the pcalls are breaking the script because without them, it works fine. But obviously, you need pcalls in saving scripts..