attempt to index a nil value, but trying to see if its nil?

Hey. I know I had a similiar problem. But this is another one. I am trying to get Values from a Folder. I have a little script which should see if this Value exists. But now, I just get the error "Attempt to index a nil value. Line 134"

Script:

for i, user in ipairs(UserCount4) do
	
		NumberD2 = 0
		
	    
	repeat
		NumberD2 = NumberD2 + 1
		FName = "User" .. NumberD2
		wait(0.1)
	--Line 134 
until workspace.AllPlayer:FindFirstChild(FName).Value == not nil