diff --git a/src/platforms/xiaohongshu/feed-detail.ts b/src/platforms/xiaohongshu/feed-detail.ts
index 1a29245..ba0b1b2 100644
--- a/src/platforms/xiaohongshu/feed-detail.ts
+++ b/src/platforms/xiaohongshu/feed-detail.ts
@@ -297,7 +297,9 @@ export async function getSubComments(
   const parentIndex = await page.evaluate((cid: string) => {
     const parents = document.querySelectorAll('.parent-comment');
     for (let i = 0; i < parents.length; i++) {
-      const item = parents[i].querySelector('.comment-item');
+      const parent = parents.item(i);
+      if (!parent) continue;
+      const item = parent.querySelector('.comment-item');
       if (!item) continue;
       const id =
         item.getAttribute('id')?.replace(/^comment-/, '') ??
diff --git a/tsconfig.json b/tsconfig.json
index ad70696..5f2a5e7 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -3,7 +3,7 @@
     "target": "ES2022",
     "module": "ESNext",
     "moduleResolution": "bundler",
-    "lib": ["ES2022"],
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
     "outDir": "dist",
     "rootDir": "src",
     "strict": true,