Confusing text box error attempt to conpare number with < nil?

So this is my script:

local player = game.Players.LocalPlayer
local tokens = player.leaderstats.Tokens

script.Parent.MouseButton1Click:Connect(function()
	if tonumber(script.Parent.Text) > game.ReplicatedStorage.CurrentBid.Value or 				game.ReplicatedStorage.CurrentBid.Value == nil then
		if tonumber(script.Parent.Text) <= tokens.Value then
			game.ReplicatedStorage.NewBid:FireServer(tonumber(script.Parent.Text))
		end
	end
end)

For some reason i get the error "attempt to compare number with < nil" which is really odd. I have done some investigating and it seems as if when you enter text into the text box and press enter, it doesnt register in the "Text" property of the textbox.

Help appreciated.

Guessing that you're talking about tonumber(script.Parent.Text) <= tokens.Value as you've mentioned < in the error. This happens when script.Parent.Text is not a number, in which case tonumber(script.Parent.Text) will return nil.

To fix this, I recommend simply adding a check if it is a number or not and cancelling the function if it isn't:

local player = game.Players.LocalPlayer
local tokens = player.leaderstats.Tokens

script.Parent.MouseButton1Click:Connect(function()
	if tonumber(script.Parent.Text) == nil then return end -- Usually I'd recommend doing `not tonumber(script.Parent.Text)` instead of `tonumber(script.Parent.Text) == nil`, but for demonstration purposes I used the earlier instead.
	
	if tonumber(script.Parent.Text) > game.ReplicatedStorage.CurrentBid.Value or game.ReplicatedStorage.CurrentBid.Value == nil then
		if tonumber(script.Parent.Text) <= tokens.Value then
			game.ReplicatedStorage.NewBid:FireServer(tonumber(script.Parent.Text))
		end
	end
end)

Your script may load and run even before the GUIs, Frames, Textboxes, etc. So I recommend using

local player = game.Players.LocalPlayer
local char = player.Character or player.CharacterAdded:Wait()
repeat wait() until player.Character		--From my experience this usually buffers the scripts just enough for the datastore to load it.
local tokens = player:WaitForChild('leaderstats'):WaitForChild('Tokens')

Another method you may do to prevent fast loads, (though may cause a delay per click by I guess around 0.00001s depending on your processor)

Is simply to put the 'local tokens = player.leaderstats.Tokens' inside the function.