ServerScriptService.ToolSaving:9: bad argument #1 to 'pairs' (table expected, got nil)?

Hello! im trying to use a script where the inventory of someone saves when they leave the game and rejoin again. i seem to get the error ServerScriptService.ToolSaving:9: bad argument #1 to 'pairs' (table expected, got nil) (line 9) Does anyone know what the problem is? Thanks!

local Data = game:GetService("DataStoreService"):GetDataStore("Inventory")

game.Players.PlayerAdded:Connect(function(plr)

 local SavedStuff = Data:GetAsync(plr.userId)

 if SavedStuff == nil then

  for i,v in pairs(SavedStuff)do

   if game.ServerStorage.Inventory:FindFirstChild(v)~= nil then

    local Weapon = game.ServerStorage.Inventory:FindFirstChild(v):Clone()

             Weapon.Parent = plr:WaitForChild("Backpack")

          end

         end

 end

 plr.CharacterRemoving:Connect(function()

  plr.Character.Humanoid:UnequipTools()

 end)

end)



game.Players.PlayerRemoving:Connect(function(plr)

 local Table = {}

 for i,v in pairs(plr.Backpack:GetChildren())do

  table.insert(Table,v.Name)

 end

 if Table ~= nil then

     Data:SetAsync(plr.userId,Table)

 end

end)