My Anticheat script got an warning?

So i have this anticheat thing that is supposed to delete gui's that were randomly added to playergui but for some reason i got this warning:

Something unexpectedly tried to set the parent of ScreenGui to NULL while trying to set the parent of ScreenGui. Current parent is PlayerGui. (x58) - Studio

Script:

while wait(0.3) do
	game.Players.LocalPlayer.PlayerGui.ChildAdded:Connect(function(child)
		if child.ClassName == "ScreenGui" then
			child:Remove()
		end
	end)
end

You should wait a few seconds before deleting the Gui.

I recommend using Instance:Destroy() instead of Instance:Remove() because it only parents it to nil, unlike Instance:Destroy() which locks all properties and sets it to nil, disconnects all events, and sets the parent to nil. This also applies to its children.

Also I don't recommend connecting an event in a loop, the loop is really unnecessary.

local Players = game:GetService("Players")
local Debris = game:GetService("Debris")

local Player = Players.LocalPlayer
local PlayerGui = Player:WaitForChild("PlayerGui")

PlayerGui.ChildAdded:Connect(function(child)
	if child:IsA("ScreenGui") then -- similar to `if child.ClassName == "ScreenGui" then`
		Debris:AddItem(child, 0.3) -- similar to `task.wait(0.3); child:Destroy()`
	end
end)