diff --git a/templates/partials/doc/toc_script.html b/templates/partials/doc/toc_script.html
index 1453a69..7d10ee6 100644
--- a/templates/partials/doc/toc_script.html
+++ b/templates/partials/doc/toc_script.html
@@ -37,10 +37,16 @@ function isVisible(tocIndex) {
         : document.querySelectorAll("section.section").item(1);
 
     const c = current.getBoundingClientRect();
-    const n = next.getBoundingClientRect();
-    const h = (window.innerHeight || document.documentElement.clientHeight);
+    if (next) {
+      const n = next.getBoundingClientRect();
+      const h = (window.innerHeight || document.documentElement.clientHeight);
 
-    return (c.top <= h) && (n.top - menuBarHeight >= 0);
+      return (c.top <= h) && (n.top - menuBarHeight >= 0);
+    } else {
+      const h = (window.innerHeight || document.documentElement.clientHeight);
+
+      return (c.top <= h);
+    }
 }
 
 function activateIfVisible() {
@@ -73,4 +79,4 @@ document.addEventListener("DOMContentLoaded", function() {
     activeDocPage.parentElement.parentElement.previousElementSibling.previousElementSibling.checked = false;
 });
 
-</script>
\ No newline at end of file
+</script>