diff --git a/lib/utils/SchemaManager.js b/lib/utils/SchemaManager.js
index e70109f6..1afce1c7 100644
--- a/lib/utils/SchemaManager.js
+++ b/lib/utils/SchemaManager.js
@@ -119,6 +119,7 @@ export default class SchemaManager {
             tag2MethodMapping.set(tag, tagDetails);
           }
           if (tagDetails['x-secondaryTag']) continue;
+          if (!tagDetails.methods) tagDetails.methods = [];
           tagDetails.methods.push({pointer: methodPointer, summary: methodSummary});
         }
       }