From 580d79157c0443068ffdfc3677a8edde35137036 Mon Sep 17 00:00:00 2001
From: Hsu-Pei-Chun <philsophysis@gmail.com>
Date: Thu, 25 Dec 2025 00:37:10 +0800
Subject: [PATCH] fix: add type check for REST API response header

---
 functions.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/functions.php b/functions.php
index bd0deff..b880e59 100644
--- a/functions.php
+++ b/functions.php
@@ -79,7 +79,9 @@ public function add_security_headers() {
      * Add headers to REST API responses
      */
     public function add_rest_api_headers($response) {
-        $response->header('X-Robots-Tag', 'noindex, nofollow');
+        if ($response instanceof WP_REST_Response) {
+            $response->header('X-Robots-Tag', 'noindex, nofollow');
+        }
         return $response;
     }