Head is not a valid member of Model "Workspace.(username)", what do I do?

What do I do? When I try naming myself using adonis admin it kills me when it shows that message.

local groupid = 5814603
local rep = game:GetService("ServerStorage")	
local nametag = rep.NameTag


game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(char)
		local head = char.Head	
		local newtext = nametag:Clone()
		local uppertext = newtext.UpperText
		local lowertext = newtext.LowerText
		local PlayerRank = player:GetRoleInGroup(groupid)
		local humanoid = char.Humanoid
		humanoid.DisplayDistanceType = "None"


		newtext.Parent = head
		newtext.Adornee = head
		uppertext.Text = player.Name
		lowertext.Text = PlayerRank
		lowertext.TextColor3 = Color3.fromRGB(46, 255, 255)
	end)
end)

This is my name GUI script. If you know what's wrong that'd be great.

P.S - I'm not asking for a solution that changes the name in the script, all I want it is so that if you try naming using adonis admin you don't get killed! Some people may accidentally use the command so I'd like to fix it, thank you!

Try

local head = char:WaitForChild("Head") 

let me know if that worked.