Getting XP level from all sleepers?

Code:

foreach (BasePlayer player in BasePlayer.sleepingPlayerList)
            {
                    PrintToChat(player.xp.CurrentLevel.ToString());
            }

Code:

NullReferenceException: Object reference not set to an instance of an object

What I am doing wrong?

 

Code:

     for(int i = 0; i < BasePlayer.sleepingPlayerList.Count; i++)
            {
                var player = BasePlayer.sleepingPlayerList[i];
                if (player == null || player.IsConnected()) continue;
                var xp = player?.xp?.CurrentLevel ?? 0f;
                Puts(player.displayName + " is level: " + xp);
            }

Works for me.

 

No, it works for offline players. That's the reason I pasted it, I'm sure of it because I've been using it to see who the highest level is. The only way you can't get XP as far as I know is if the player is dead and disconnected. The sleeper still seems to contain the info, and is in fact a BasePlayer, at least asf ar as I've been able to tell.

EDIT: If you were referring to the continue, it checks if the player IS connected and skips them, as that was handled in the activeplayerlist, which I did not paste.