diff --git a/session/sess_file.go b/session/sess_file.go
index f7a739cc0ab3acb7e7b14322f9f97583a0b2cbf8..47ad54a7fe015f18c4744fdf15a9eca0f0b9e08c 100644
--- a/session/sess_file.go
+++ b/session/sess_file.go
@@ -181,6 +181,7 @@ func (fp *FileProvider) SessionExist(sid string) bool {
 	defer filepder.lock.Unlock()
 
 	if len(sid) < 2 {
+		SLogger.Println("min length of session id is 2", sid)
 		return false
 	}