Any clue how to make this not error?

Help and Feedback Scripting Support
#23 
local rs = game:GetService("ReplicatedStorage")

local dummy = workspace.Dummy
local humanoid = dummy.Humanoid

local function respawn()
	dummy:Destroy()

	local dummy = game.ReplicatedStorage.Dummy
	local cd = dummy:Clone()

	cd.HumanoidRootPart.CFrame = dummy.HumanoidRootPart.CFrame
	cd.Parent = game.Workspace
end

humanoid.Died:Connect(respawn)

This works perfectly fine

#24

No longer lags out the game but still only respawns once

#25

Remove the dummy from ReplicatedStorage and test this inside the original dummy, also remove the script from serverscriptservice.

For some reason if you do not set a cooldown of at least 5 secs the script will return a nil value.

--variables
name="Humanoid"
dummy=script.Parent:clone()

while true do
	wait(5)
	
	--respawn
	if script.Parent.Humanoid.Health<1 then
		newdummy=dummy:clone()
		newdummy.Parent=script.Parent.Parent
		newdummy:makeJoints()
		script.Parent:remove()
	end
	--
	
end

It will probably still return a nil value but it will work.