diff --git a/website/src/components/LeftSidebar/LeftSidebar.astro b/website/src/components/LeftSidebar/LeftSidebar.astro
index ce4dbb80..b3f69a7e 100644
--- a/website/src/components/LeftSidebar/LeftSidebar.astro
+++ b/website/src/components/LeftSidebar/LeftSidebar.astro
@@ -47,10 +47,11 @@ const sidebar = SIDEBAR[langCode];
 </nav>
 
 <script is:inline>
-  window.addEventListener('DOMContentLoaded', () => {
-    var target = document.querySelector('[aria-current="page"]');
-    if (target && target.offsetTop > window.innerHeight - 100) {
-      document.querySelector('.nav-groups').scrollTop = target.offsetTop;
-    }
-  });
+window.addEventListener('DOMContentLoaded', () => {
+  var target = document.querySelector('[aria-current="page"]');
+  const nav = document.querySelector('.nav-groups');
+  if (nav && target && target.offsetTop > window.innerHeight - 100) {
+    nav.scrollTop = target.offsetTop;
+  }
+});
 </script>