"Sit: param is not a Humanoid or Humanoid is dead" Humanoid returning dead, but it is not??

Im trying to sit npc's from a folder into a random seat. When I attempt to use Seat:Sit(), it returns an error. I tried to add wait() and a repeat wait() until to determine if the humanoid actually exists, and if the npc exists and is in a folder in the workspace. Still doesn't work. Help?

Main code:

local getRandomModule = require(script.Random) -- will include in next script
function updateChairs()
	local players = game.Players:GetChildren()
	local npcs = game.ReplicatedStorage.NPCs:GetChildren()
	local chairs = workspace.TableSet.Chairs:GetChildren()
	local difference = #npcs - #players
	for i = 1,difference,1 do
		local npc = npcs[i]:Clone()
		npc.Parent = workspace.Holders
		local hum = npc:WaitForChild("Humanoid")
		repeat wait() until hum.Parent == npc and npc.Parent == workspace.Holders -- waiting until hum is parented/exists and if npc exists in workspace.Holders but no effect
		local chair = getRandomModule.getRandom(chairs,"Occupant",nil)
		wait(1) -- added a wait() but still no effects
		chair.Seat:Sit(hum)
		hum.Sit = true
	end
end
game.Players.PlayerAdded:Connect(function()
	updateChairs()
end)

I will include the module script as well just in case that is the problem, though it seems to work perfectly fine

local module = {}
function module.getRandom(table,value,desired)
	local random = table[math.random(1,#table)]
	if value and desired then
		if random[value] == desired then
			return random
		else
			repeat
				random = table[math.random(1,#table)]
				wait()
			until random[value] == desired
			return random
		end
	else
		return random
	end
end
return module

Thanks :)