Something like that under "public void run() {"Code:for(int i = 0; i < server.playerHandler.players.length; i++){ Player p = server.playerHandler.players[i]; if(p != null && !p.disconnected && p.connectedFrom.equals(connectedFrom) && playerId != p.playerId && !connectedFrom.equals("localhost")){ returnCode = 9; disconnected = true; return; } }