diff --git a/wshandler/wshandler.go b/wshandler/wshandler.go
index 375fce6..7bbf1d8 100644
--- a/wshandler/wshandler.go
+++ b/wshandler/wshandler.go
@@ -729,6 +729,11 @@ func (ws *WebsocketHandler) upgrade(w http.ResponseWriter, r *http.Request) {
 	}()
 
 	sk := r.Header.Get("AS-X-SESSION")
+	if len(sk) == 0 {
+		w.WriteHeader(http.StatusUnauthorized)
+		return
+	}
+
 	authinfo, err := ws.sessionConsumer.Query(sk)
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)