diff --git a/packages/share-theme/src/templates/prev_next.ejs b/packages/share-theme/src/templates/prev_next.ejs
index ea93cd336..ddc4919f8 100644
--- a/packages/share-theme/src/templates/prev_next.ejs
+++ b/packages/share-theme/src/templates/prev_next.ejs
@@ -15,13 +15,12 @@
         // We are not the first child at this level so previous
         // should go to the end of the previous tree
         let candidate = children[index - 1];
-        while (candidate.hasVisibleChildren()) {
+        while (candidate?.hasVisibleChildren()) {
             const children = candidate.getVisibleChildNotes();
-            const lastChild = children[children.length - 1];
-            candidate = lastChild;
+            candidate = children[children.length - 1];
         }
 
-        return candidate;
+        return candidate ?? null;
     })();
 
     const nextNote = (() => {