diff --git a/core/service.go b/core/service.go
index 0175f37..bbe5f8d 100644
--- a/core/service.go
+++ b/core/service.go
@@ -576,31 +576,35 @@ func (sh *serviceDescription) authorize(w http.ResponseWriter, r *http.Request)
 	var email string
 
 	if !*noauth {
-		//email, err := sh.readProfile(authtype, uid, accesstoken)
-		bfinfo, err := sh.getUserBrowserInfo(r)
-		if err != nil {
-			logger.Error("getUserBrowserInfo failed :", err)
-			w.WriteHeader(http.StatusBadRequest)
-			return
-		}
+		if len(authtype) > 0 {
+			//email, err := sh.readProfile(authtype, uid, accesstoken)
+			bfinfo, err := sh.getUserBrowserInfo(r)
+			if err != nil {
+				logger.Error("getUserBrowserInfo failed :", err)
+				w.WriteHeader(http.StatusBadRequest)
+				return
+			}
 
-		email, err = sh.readProfile(authtype, uid, bfinfo)
-		if err != nil {
-			logger.Error("readProfile failed :", err)
-			w.WriteHeader(http.StatusBadRequest)
-			return
-		}
+			email, err = sh.readProfile(authtype, uid, bfinfo)
+			if err != nil {
+				logger.Error("readProfile failed :", err)
+				w.WriteHeader(http.StatusBadRequest)
+				return
+			}
 
-		newType, newId, err := sh.getProviderInfo(authtype, uid)
-		if err != nil {
-			logger.Error("getProviderInfo failed :", err)
-			w.WriteHeader(http.StatusBadRequest)
-		}
+			newType, newId, err := sh.getProviderInfo(authtype, uid)
+			if err != nil {
+				logger.Error("getProviderInfo failed :", err)
+				w.WriteHeader(http.StatusBadRequest)
+			}
 
-		if authtype != newType || uid != newId {
-			authtype = newType
-			uid = newId
-			logger.Println("auth success ( redirect ) :", authtype, uid, email, session)
+			if authtype != newType || uid != newId {
+				authtype = newType
+				uid = newId
+				logger.Println("auth success ( redirect ) :", authtype, uid, email, session)
+			}
+		} else {
+			email = fmt.Sprintf("%s@guest.flag", uid)
 		}
 	} else {
 		email = fmt.Sprintf("%s@noauth.flag", uid)