How do i solve this FindFirstChild problem?

I have been trying to solve this problem for 2 hours.

Workspace.TycoonModel.Script.MainScript:27: attempt to index nil with 'FindFirstChild'

This is the code:

for i, v in pairs(Buttons:GetChildren()) do local Newitem = Boughtitems:FindFirstChild(v.Item.Value) if Newitem ~= nil then Items[Newitem.Name] = Newitem:Clone() Newitem:Destroy() else v.ButtonPart.Transparecy = 1 v.Button.CanCollide = false end

I don't know what to do at:

local Newitem = Boughtitems:FindFirstChild(v.Item.Value)

Please help! Thank you.