diff --git a/lib/components/Method/method.js b/lib/components/Method/method.js
index a42cafc5..05674deb 100644
--- a/lib/components/Method/method.js
+++ b/lib/components/Method/method.js
@@ -31,6 +31,7 @@ export default class Method extends BaseComponent {
 
   filterMainTags(tags) {
     var tagsMap = this.schemaMgr.getTagsMap();
+    if (!tags) return [];
     return tags.filter(tag => tagsMap[tag] && tagsMap[tag]['x-traitTag']);
   }