Help With Detection Script?

while true do
	wait()
	local player = game.Players.LocalPlayer
	local plr = game.Players.LocalPlayer.Character
	if player then
		if plr then
			if player.HatEquiped.Value ~= "Empty" then
				for i,v in pairs(plr:GetChildren()) do
					if v.ClassName == "Hat" then
						local verification = v:FindFirstChild("HatVerifier")
						if verification then
							local hatwearing = v.Name
							if player.HatEquiped.Value ~= hatwearing then
								v:Destroy()
								local hatnowwearing = game.ReplicatedStorage:FindFirstChild(""..player.HatEquiped.Value..""):Clone()
								if hatnowwearing then
									hatnowwearing.Parent = plr
								end
							end
						elseif verification == nil then
							local hatnowwearing = game.ReplicatedStorage:FindFirstChild(""..player.HatEquiped.Value..""):Clone()
								if hatnowwearing then
									hatnowwearing.Parent = plr
								end
						end
					end
				end
			end
		end
	end
end

The specific issue is on line 21, it says that it's trying to detect a nil value

Basically, this is a script for character customization in my game. Each hat in my game has a value in it to distinguish it from Roblox Avatar hats. In line 21 it tries to make a value to Clone a hat from Replicated Storage if it's name is the same as the value of the hat that the character is supposed to be wearing. I tried to use FindFirstChild so that it wouldn't have the issue, but it is anyways. Help?

Insufficient. Show me the hierarchy and tell me the data type.