Teleport npc's when i only want players

Hello everyone!

I'm developing a factions plugin but i have a mistake and i have no idea about how fix it.

On resume, i need to tp all the players in one world to the spawn:

Code:

public static void teleportAllPlayerOutWorld(Location location) {
        for (Player player : Bukkit.getServer().getWorld("customworld").getPlayers()) {
            player.sendMessage(Utils.chat("&bYou have been teleported to the spawn."));
            player.teleport(location);
        }
    }

The problem, i've another plugin that spawn a npc on this world, and when i tp all the players, the npc is send to the spawn too.

How can i filter to tp only the real players and not npc?

Thanks!

 

@timtower it's a sandbot

It's a NPC from CitizensAPI

 

It's a NPC from CitizensAPI

 

Okay i fixed it just adding to the path Citizens plugin and

Code:

for (Player player : Bukkit.getServer().getWorld("customworld").getPlayers()) {
            if (!CitizensAPI.getNPCRegistry().isNPC(player)) {
                player.sendMessage(Utils.chat("&bYou have been teleported to spawn"));
                player.teleport(location);
            }
        }

I don't know if there is other way of doing it withoud adding Citizens, but at least it works i think, im gonna test it now.