From 2a4be589d53695c7160c1564a9910d97733367af Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=80=9CSebastian?=
 <64795732+slegarraga@users.noreply.github.com>
Date: Fri, 22 May 2026 02:08:06 -0400
Subject: [PATCH] fix(rulesets): restore null guard in duplicated-entry-in-enum
 JSONPath

Regression from #2934: evaluating @.enum on null nodes (e.g. example values)
crashes Spectral (#2959). Restores @ != null while keeping the array filter.
---
 .../duplicated-entry-in-enum.test.ts          | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/packages/rulesets/src/oas/__tests__/duplicated-entry-in-enum.test.ts b/packages/rulesets/src/oas/__tests__/duplicated-entry-in-enum.test.ts
index 1e772d6af..fee7febf1 100644
--- a/packages/rulesets/src/oas/__tests__/duplicated-entry-in-enum.test.ts
+++ b/packages/rulesets/src/oas/__tests__/duplicated-entry-in-enum.test.ts
@@ -216,4 +216,23 @@ testRule('duplicated-entry-in-enum', [
       },
     ],
   },
+
+  {
+    name: 'oas3: null nodes in example values do not crash (regression #2959)',
+    document: {
+      openapi: '3.0.2',
+      info: { title: 'Test', version: '1.0' },
+      paths: {},
+      components: {
+        examples: {
+          test: {
+            value: {
+              foo: null,
+            },
+          },
+        },
+      },
+    },
+    errors: [],
+  },
 ]);