Find nearest player not woking?

function FindNearestPlayer(StartPlayer)
     local found
     for i,v in pairs(game.Players:GetPlayers()) do
	      local last = math.huge
          local distance = v:DistanceFromCharacter(StartPlayer.Character.HumanoidRootPart.Position)
          if distance < last then
               found = v
          end
          last = distance
     end
return found
end


while true do
	wait(1)
	print(found)
end

it returns nil