socket io crash

with less then a 1000 clients somehow crashed on 
     socket.manager.handshaken[socket.store.id].address.address;

```
    var self=this;
    this.io.sockets.on('connection', function (socket) {
           socket.store['ip']=socket.manager.handshaken[socket.store.id].address.address;
           ....
           ....
    });
```
