From 888721dd7ca5ff797c5725f5aaa9bafa2d29f618 Mon Sep 17 00:00:00 2001
From: brunomartinspro <hello@brunomartins.pro>
Date: Tue, 27 Sep 2022 14:42:20 +0100
Subject: [PATCH] guard against nullable x-circular-ref

---
 src/services/OpenAPIParser.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/services/OpenAPIParser.ts b/src/services/OpenAPIParser.ts
index e5c079e0..26ec31ba 100644
--- a/src/services/OpenAPIParser.ts
+++ b/src/services/OpenAPIParser.ts
@@ -171,7 +171,7 @@ export class OpenAPIParser {
     $ref: string | undefined,
     refsStack: string[],
   ): MergedOpenAPISchema {
-    if (schema['x-circular-ref']) {
+    if (schema?.hasOwnProperty('x-circular-ref')) {
       return schema;
     }