diff --git a/core/service.go b/core/service.go
index 123eae2..85098ee 100644
--- a/core/service.go
+++ b/core/service.go
@@ -329,20 +329,6 @@ func (sh *serviceDescription) link(w http.ResponseWriter, r *http.Request) {
 	// fmt.Println(oldAuth.Uid)
 	// fmt.Println("=================")
 
-	oldType, oldId, err := sh.getProviderInfo(oldType, oldId)
-	if err != nil {
-		logger.Error("getProviderInfo failed :", err)
-		w.WriteHeader(http.StatusBadRequest)
-		return
-	}
-
-	//if oldAuth.Token != oldToken || oldAuth.Uid != oldId || oldAuth.Platform != oldType {
-	if oldAuth.Uid != oldId || oldAuth.Platform != oldType {
-		logger.Println("link failed. session key is not correct :", *oldAuth, queryvals)
-		w.WriteHeader(http.StatusBadRequest)
-		return
-	}
-
 	bfinfo, err := sh.getUserBrowserInfo(r)
 	if err != nil {
 		logger.Error("getUserBrowserInfo failed :", err)
@@ -362,6 +348,20 @@ func (sh *serviceDescription) link(w http.ResponseWriter, r *http.Request) {
 		logger.Println("from guest acc to real acc link : ", oldId, bfinfo, newType, newId, bfinfo)
 	}
 
+	oldType, oldId, err = sh.getProviderInfo(oldType, oldId)
+	if err != nil {
+		logger.Error("getProviderInfo failed :", err)
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	//if oldAuth.Token != oldToken || oldAuth.Uid != oldId || oldAuth.Platform != oldType {
+	if oldAuth.Uid != oldId || oldAuth.Platform != oldType {
+		logger.Println("link failed. session key is not correct :", *oldAuth, queryvals)
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
 	email, err := sh.readProfile(newType, newId, bfinfo)
 	if err != nil {
 		logger.Error("readProfile(new) failed :", err)