diff --git a/src/primitives/Lazy.tsx b/src/primitives/Lazy.tsx
index f76bdd1..ac8097f 100644
--- a/src/primitives/Lazy.tsx
+++ b/src/primitives/Lazy.tsx
@@ -144,7 +144,7 @@ function createLazy<T>(
   const updateOffset = (_event: KeyboardEvent, container: lng.ElementNode) => {
     const maxOffset = props.each ? props.each.length : 0;
     const selected = container.selected || 0;
-    const rendered = offset(); // == container.children.length
+    const rendered = container.children?.length || 0;
 
     // Already mounted everything, or still far enough from the rendered edge
     // that the buffer covers the next selection — no work to do.