fix: exception in standalone mode

v2/common/cache.go

@@ -40,7 +40,9 @@ func (s *StorageService) Start() error {
 }
 
 func (s *StorageService) Close() error {
-	Storage.DB.Close()
+	if Storage.DB != nil {
+		Storage.DB.Close()
+	}
 	return nil
 }
 

v2/service_manager/hiddify.go

@@ -18,6 +18,7 @@ func Register(service adapter.Service) {
 }
 
 func StartServices() error {
+	CloseServices()
 	for _, service := range preservices {
 		if err := service.Start(); err != nil {
 			return err