Square brackets are giving me a nil value?

I am trying to get my script to find a random value within another folder but on like 16 where I use square brackets, it says that I attempted to index nil ([box]) with 'Q'.

local numbersentered = {}

script.Parent.BackgroundFrame.QuestionNumber.Changed:Connect(function()
	
	local box = math.random(1,20)
	print(box)
	table.insert(numbersentered, box)
	
	for i,v in pairs(numbersentered)do
		if box == v then
			local box = math.random(1,20)
	        print(box)
	        table.insert(numbersentered, box)
			
		else
			local text = game.ServerStorage:FindFirstChild("Questions").Q[box].Value
            for  i = 1, #text do
		        script.Parent.TextLabel.Text = string.sub (text, 1, i)
			end
			
		end
	end
	
end)

Any help is wonderful!

The full error is:

05:04:51.791 - Players.GoingToAnnoyYou.PlayerGui.ApplicationUI.QuestionScript:16: attempt to index nil with 'Q'
05:04:51.791 - Stack Begin
05:04:51.791 - Script 'Players.GoingToAnnoyYou.PlayerGui.ApplicationUI.QuestionScript', Line 16
05:04:51.792 - Stack End