diff --git a/lib/index.js b/lib/index.js
index <HASH>..<HASH> 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -297,7 +297,7 @@ function exportInterfaces(obj) {
   obj.logger = logger;
   obj.getImpExpService = function(callback) {
     loadService(function(err, options) {
-      callback(err, options.port);
+      callback(err, options && options.port);
     });
   };
   return obj;
feat: Export saz file