Object reference not set to an instance of an object.
   at DungeonCrawler.FullScreenArenaLobbyOverlay.SetupDisabledWaves()
   at DungeonCrawler.FullScreenArenaLobbyOverlay.RefreshLobby()
   at DungeonCrawler.FullscreenOverlayControllerComponent.CloseFullscreen()
   at DungeonCrawler.FullScreenGameDialogs.HandleInput_DetailedError(PlayerInputState inputState)
   at DungeonCrawler.FullScreenGameDialogs.Update(GameTime gameTime)
   at DungeonCrawler.FullscreenOverlayControllerComponent.Update(GameTime gameTime)
   at Microsoft.Xna.Framework.Game.<.cctor>b__19(IUpdateable updateable, GameTime gameTime)
   at Microsoft.Xna.Framework.Game.SortingFilteringCollection`1.ForEachFilteredItem[TUserData](Action`2 action, TUserData userData)
   at DungeonCrawler.DungeonCrawlerGame.Update(GameTime gameTime)
   at Microsoft.Xna.Framework.Game.Tick()
   at Microsoft.Xna.Framework.SDL2_FNAPlatform.RunLoop(Game game)
   at Microsoft.Xna.Framework.Game.Run()
   at DungeonCrawler.Program.Main(String[] args)