AddAccessory should be passed a valid Accessory object.?

I'm trying to add custom accessories added to the player onced joined when in specific teams. The problem sometimes shows this error and the accessories don't show up. On line 22, I the part removes the players custom accessories then replaced with the the team accessories. So why doesn't it work? Thanks.

local ss = game:GetService("ServerStorage")

local function playerAdded(player)
	player.CharacterAdded:Connect(function(char)	
		
		local vest = nil
		local hat = nil
		local leg = nil
		
		if player.Team.Name == "Chief" then
			
			vest = ss.Uniforms.Chief:WaitForChild("Vest"):Clone()
			hat = ss.Uniforms.Chief:WaitForChild("Hat"):Clone()
			leg = ss.Uniforms.Chief:WaitForChild("Leg"):Clone()
			
         elseif player.Team.Name == "---" then
			vest = ss:WaitForChild("---"):Clone()
		end
		
		local hum = char:WaitForChild("Humanoid")
		
		for i, v in pairs(char:GetChildren()) do
			if v:IsA("Accessory") then
				v:Destroy()
			end
		end
		
		wait()
						
		--[[hum:AddAccessory(vest)
		
		hum:AddAccessory(hat)
		
		hum:AddAccessory(leg)]]

hum:AddAccessory(vest, hat, leg)
		
	end)
end

game.Players.PlayerAdded:Connect(playerAdded)