FIX worker close panic

uiserver/server.go

@@ -18,6 +18,7 @@ type Worker struct {
 func NewWorker(conn net.Conn) Worker {
 	w := Worker{Conn: conn}
 	w.Update = make(chan interface{}, 10)
+	w.Exit = make(chan interface{})
 	return w
 }
 
@@ -42,8 +43,6 @@ func (w *Worker) Work() {
 			err := w.send(obj)
 			if err != nil {
 				w.Conn.Close()
-				close(w.Update)
-				close(w.Exit)
 				return
 			}
 		}