diff --git a/static/script/toc.js b/static/script/toc.js
index 826cff9..4a16e6d 100644
--- a/static/script/toc.js
+++ b/static/script/toc.js
@@ -14,16 +14,18 @@ if (toc) {
     toc.parentElement.remove();
   } else {
     const observer = new IntersectionObserver((entries) => {
-      const filtered = entries.filter((i) => getId(i.target));
-      filtered.forEach((entry) => {
-        const id = getId(entry.target);
-        if (id && entry.intersectionRatio > 0) {
-          toc.querySelector(`li.active`)?.classList.remove("active");
+      const filtered = entries.filter(
+        (i) => getId(i.target) && i.intersectionRatio > 0
+      );
+      if (filtered.length > 0) {
+        toc.querySelector(`li.active`)?.classList.remove("active");
+        filtered.forEach((entry) => {
+          const id = getId(entry.target);
           toc
             .querySelector(`li a[href="#${id}"]`)
             .parentElement.classList.add("active");
-        }
-      });
+        });
+      }
     });
 
     // Track all sections that have an `id` applied