Local Variable Changing to Nil between lines??

I have this localscript that's supposed to:

1. Wait for the StringValue "Current" to change
2. Delete all the letters of the text box it's a child of one by one
3. Retype them
4. Wait until a change has been made

local Shop = script.Parent.Parent
local Bar = script.Parent
local Current = Shop.Current

while true do
	--local Text = Current.Value
	--local NewText = Text 
	if NewText == "" then
		local Text = "Select Item"
		local NewText = Text 
		print (NewText)
	end
	if Current.Value == "GFL" then
		NewText = "Golden Flashlight"
	end
	if Current.Value == "SPB" then
		NewText = "Sprint Boost"
	end
	if Current.Value == "SMA" then
		NewText = "Stamina Boost"
	end
	while Bar.Text == NewText do
		if Current.Value == "GFL" then
			NewText = "Golden Flashlight"
		end
		if Current.Value == "SPB" then
			NewText = "Sprint Boost"
		end
		if Current.Value == "SMA" then
			NewText = "Stamina Boost"
		end
		wait()
	end
	local times = Bar.Text:len()
	local Text = NewText
	for count = 1, times do
		Text = (string.match(Bar.Text, "$"))
		wait(0.05)
		Bar.Text = Text
	end
	if NewText ==  nil then
		local Text = "Select Item"
		local NewText = Text 
		print (NewText)
	end
	print(NewText)
	local times = NewText:len()
	--for i, letter in pairs(string.split(NewText,"")) do
--		Bar.Text = Bar.Text..""..letter
--		local Text = Text..""..letter
--		wait(0.05)
--	end
	wait()
end

I'm sure the answers obvious, but the output at line 44 reads as "Select Item," but line 46 reads Nil. Is there something affecting it between the two?? Please help Edit: The comment part at the bottom is the part that deletes the old text one by one

I believe that your problem is how you are setting the variable. You are making a local variable inside of an if statement. This means that you can only use this variable inside of that statement. For example:

local a = 1

if a = 1 then
	local b = 2
end

print (b) --returns nil because b is set as a local value in the if statement.

To fix this, you instead define the variable here:

local a = 1
local b = nil

if a = 1 then
	b = 2
end

print(b) --returns 2

Hope this helped and let me know if you still don't quite understand why this happens.