diff --git a/controller.go b/controller.go
index ccf213aa..b7804f33 100644
--- a/controller.go
+++ b/controller.go
@@ -275,21 +275,21 @@ func (c *Controller) StartSession() session.SessionStore {
 	return c.CruSession
 }
 
-func (c *Controller) SetSession(name string, value interface{}) {
+func (c *Controller) SetSession(name interface{}, value interface{}) {
 	if c.CruSession == nil {
 		c.StartSession()
 	}
 	c.CruSession.Set(name, value)
 }
 
-func (c *Controller) GetSession(name string) interface{} {
+func (c *Controller) GetSession(name interface{}) interface{} {
 	if c.CruSession == nil {
 		c.StartSession()
 	}
 	return c.CruSession.Get(name)
 }
 
-func (c *Controller) DelSession(name string) {
+func (c *Controller) DelSession(name interface{}) {
 	if c.CruSession == nil {
 		c.StartSession()
 	}
diff --git a/session/sess_file.go b/session/sess_file.go
index d5ab6b4a..0994c83a 100644
--- a/session/sess_file.go
+++ b/session/sess_file.go
@@ -58,11 +58,13 @@ func (fs *FileSessionStore) SessionRelease() {
 }
 
 func (fs *FileSessionStore) updatecontent() {
-	b, err := encodeGob(fs.values)
-	if err != nil {
-		return
+	if len(fs.values) > 0 {
+		b, err := encodeGob(fs.values)
+		if err != nil {
+			return
+		}
+		fs.f.Write(b)
 	}
-	fs.f.Write(b)
 }
 
 type FileProvider struct {
diff --git a/session/sess_mysql.go b/session/sess_mysql.go
index a55d5612..217227e9 100644
--- a/session/sess_mysql.go
+++ b/session/sess_mysql.go
@@ -55,11 +55,13 @@ func (st *MysqlSessionStore) SessionID() string {
 }
 
 func (st *MysqlSessionStore) updatemysql() {
-	b, err := encodeGob(st.values)
-	if err != nil {
-		return
+	if len(st.values) > 0 {
+		b, err := encodeGob(st.values)
+		if err != nil {
+			return
+		}
+		st.c.Exec("UPDATE session set `session_data`= ? where session_key=?", b, st.sid)
 	}
-	st.c.Exec("UPDATE session set `session_data`= ? where session_key=?", b, st.sid)
 }
 
 func (st *MysqlSessionStore) SessionRelease() {