diff --git a/core/service.go b/core/service.go
index 4a06be6..b7d0572 100644
--- a/core/service.go
+++ b/core/service.go
@@ -311,7 +311,7 @@ func (sh *serviceDescription) link(w http.ResponseWriter, r *http.Request) {
 
 	//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)
+		logger.Println("link failed. session key is not correct :", oldAuth, queryvals)
 		w.WriteHeader(http.StatusBadRequest)
 		return
 	}
@@ -425,7 +425,7 @@ func (sh *serviceDescription) unlink(w http.ResponseWriter, r *http.Request) {
 	// fmt.Println("=================")
 
 	if authInfo.Uid != sId || authInfo.Platform != sType {
-		logger.Println("unlink failed. session key is not correct :", *authInfo, queryvals)
+		logger.Println("unlink failed. session key is not correct :", authInfo, queryvals)
 		w.WriteHeader(http.StatusBadRequest)
 		return
 	}
@@ -517,7 +517,7 @@ func (sh *serviceDescription) linkinfo(w http.ResponseWriter, r *http.Request) {
 
 	//if oldAuth.Token != oldToken || oldAuth.Uid != oldId || oldAuth.Platform != oldType {
 	if authInfo.Uid != sId || authInfo.Platform != sType {
-		logger.Println("linkinfo failed. session key is not correct :", *authInfo, queryvals)
+		logger.Println("linkinfo failed. session key is not correct :", authInfo, queryvals)
 		w.WriteHeader(http.StatusBadRequest)
 		return
 	}
@@ -739,7 +739,7 @@ func (sh *serviceDescription) serveHTTP(w http.ResponseWriter, r *http.Request)
 			return
 		}
 
-		if authInfo == nil {
+		if authInfo.Account.IsZero() {
 			logger.Println("sessionkey is not valid :", sk)
 			w.WriteHeader(http.StatusUnauthorized)
 			return
@@ -767,7 +767,7 @@ func (sh *serviceDescription) serveHTTP(w http.ResponseWriter, r *http.Request)
 			return
 		}
 
-		if authInfo == nil {
+		if authInfo.Account.IsZero() {
 			logger.Println("sessionkey is not valid :", sk)
 			w.WriteHeader(http.StatusUnauthorized)
 			return
diff --git a/go.mod b/go.mod
index e2d0e89..9e4dbd2 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@ require (
 	github.com/golang-jwt/jwt v3.2.2+incompatible
 	go.mongodb.org/mongo-driver v1.11.7
 	google.golang.org/api v0.128.0
-	repositories.action2quare.com/ayo/gocommon v0.0.0-20230904025656-0eefb438a6d3
+	repositories.action2quare.com/ayo/gocommon v0.0.0-20230904053533-821dc5c639d8
 )
 
 require (
diff --git a/go.sum b/go.sum
index 4bb7c23..e5307af 100644
--- a/go.sum
+++ b/go.sum
@@ -359,3 +359,5 @@ repositories.action2quare.com/ayo/gocommon v0.0.0-20230904005440-d396a35713ad h1
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230904005440-d396a35713ad/go.mod h1:PdpZ16O1czKKxCxn+0AFNaEX/0kssYwC3G8jR0V7ybw=
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230904025656-0eefb438a6d3 h1:6IBLAxab5ntTG+TGjvd7+Pm+QHipQMS7GKg+XrXjn88=
 repositories.action2quare.com/ayo/gocommon v0.0.0-20230904025656-0eefb438a6d3/go.mod h1:PdpZ16O1czKKxCxn+0AFNaEX/0kssYwC3G8jR0V7ybw=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230904053533-821dc5c639d8 h1:clQB7s726Rt/q2BgGjZMVjek7Z0YDBUrD4HjFKUFSIw=
+repositories.action2quare.com/ayo/gocommon v0.0.0-20230904053533-821dc5c639d8/go.mod h1:PdpZ16O1czKKxCxn+0AFNaEX/0kssYwC3G8jR0V7ybw=