unity udp script crashes the editor/game

in my simple udp server finder script when i select client it makes unity crash and i can't find why;

the comment code is what makes the crash; when i uncomment the while loop in StartClient function it crashes so at first i though it was the while loop that made it crash so i commented it and wrote it again in the update function so when i say that clientstarted is true in startclient() the update function will run the code but that makes it crash also, so i can't realy guess what makes it crash (when i mean crash i mean in windows make the editor not respond and eventually close itself and on android just close the app).

and if it helps here is the log file http://pastebin.com/JZ1kY62a

Code (JavaScript):

1. import System.Net.Sockets;
2. private var udp_server:UdpClient;
3. private var udp_client:UdpClient;
4. private var udp_port:int = 18000;
5. private var udp_broadcast_ip:IPAddress = IPAddress.Parse ("224.0.0.224");
6. private var udp_received_message:String;
7. private var udp_endpoint:IPEndPoint;
8. private var selected:boolean = false;
9. private var clientStarted:boolean = false;
10. function StartServer(){
11.      udp_server = new UdpClient(udp_port, AddressFamily.InterNetwork);
12.    
13.      udp_server.JoinMulticastGroup(udp_broadcast_ip);
14.      udp_endpoint = new IPEndPoint(udp_broadcast_ip, udp_port);
15.      InvokeRepeating("StartBroadcastUDP", 0.0,0.3);
16. }
17. function StartClient(){
18.      udp_client = new UdpClient();
19.      udp_endpoint = new IPEndPoint(IPAddress.Any, udp_port);
20.      udp_client.Client.Bind(udp_endpoint);
21.      udp_client.JoinMulticastGroup(udp_broadcast_ip);
22.      /*
23.      while(true){
24.          yield;
25.          var udp_received_message_byte:byte[] = udp_client.Receive(udp_endpoint);
26.          udp_received_message = Encoding.Unicode.GetString(udp_received_message_byte);
27.          print("Received Message: " + udp_received_message);
28.      }*/
29.      clientStarted = true;
30. }
31. function StartBroadcastUDP(){
32.      var udp_broadcast_message = Encoding.Unicode.GetBytes("GAME SERVER");
33.      if(udp_broadcast_message != ""){
34.          udp_server.Send(udp_broadcast_message, udp_broadcast_message.Length);
35.      }
36. }
37. function OnGUI(){
38.      if(!selected){
39.          if(GUI.Button(Rect(0, 0, 100, 100), "Server")){
40.              StartServer();
41.              selected = true;
42.          }else if(GUI.Button(Rect(100, 0, 100, 100), "Client")){
43.              StartClient();
44.              selected = true;
45.          }
46.      }
47. }
48. function Update(){
49.      /*
50.      if(clientStarted){
51.          var udp_received_message_byte:byte[] = udp_client.Receive(udp_endpoint);
52.          udp_received_message = Encoding.Unicode.GetString(udp_received_message_byte);
53.          print("Received Message: " + udp_received_message);
54.      }*/
55. }