Selling a leaderstat value for another leaderstat value?

So I be tryin' to sell 5 potatoes (Potato) for 5 experience points (XP) 'ere in this dialog. When I try it, it takes no potato nor gives any XP! What's the error? It must be in the script, since the routes outside it have been checked.

local dialog = script.Parent
dialog.DialogChoiceSelected:connect(function(player, choice)
   
	local stats = player:FindFirstChild('leaderstats')
	if not stats then return end 
	 
	local Gold = stats:FindFirstChild('Potato')
	if not Gold then return end 
	if choice == script.Parent.DialogChoice.ChoiceA then
		if Gold.Value <= 5 then           
		stats:findFirstChild('XP')
		XP.Value = XP.Value + 5
		stats:findFirstChild('Potato')
		Potato.Value = Potato.Value - 5
		end
	end
	end)

M39a9am3R's suggestion is right. You should use >= 5 instead of <= 5 since it's "if they have at least five gold, then use those five gold to..."

Please note that using FindFirstChild is only necessary when you're actually doing error checking. That means your use of it in line 7 is correct; however, the later uses are unnecessary since you do not do error-prevention with the value.

You never define the value XP, which you need to!

local XP = stats.XP -- Replaces line 11

Similarly, you use Potato later but never define it.

Instead of defining it like we did with XP just now, we should just keep using the Gold variable instead (this will also make it a little easier to re-use this snippet should we want to exchange other things for XP)

All together it should look like this:

local dialog = script.Parent
dialog.DialogChoiceSelected:connect(function(player, choice)
	local stats = player:FindFirstChild('leaderstats')
	if not stats then return end 
	local Gold = stats:FindFirstChild('Potato')
	if not Gold then return end 
	if choice == script.Parent.DialogChoice.ChoiceA then
		if Gold.Value >= 5 then
			local XP = stats.XP;
			XP.Value = XP.Value + 5
			Gold.Value = Gold.Value - 5
		end
	end
end)

You didn't set the variable of potato. So replace line 13 with this code below. If this helped please upvote my rep.

Potato = stats:FindFirstChild('Potato')