diff --git a/packages/core/src/canvas/page-guides.ts b/packages/core/src/canvas/page-guides.ts
index db0b8139e..fd134d285 100644
--- a/packages/core/src/canvas/page-guides.ts
+++ b/packages/core/src/canvas/page-guides.ts
@@ -62,7 +62,7 @@ export function drawPageGuides(
     }
   }
 
-  for (const childId of page.childIds ?? []) {
+  for (const childId of page.childIds) {
     const node = graph.getNode(childId)
     if (!node) continue
     if (node.id === page.id || node.guides.length === 0) continue
diff --git a/tests/engine/render/canvas/page-guides.test.ts b/tests/engine/render/canvas/page-guides.test.ts
index a04e5fbd8..06dcee919 100644
--- a/tests/engine/render/canvas/page-guides.test.ts
+++ b/tests/engine/render/canvas/page-guides.test.ts
@@ -11,6 +11,7 @@ import { createMockCanvas, createMockRenderer, mockCalls } from './effects/helpe
 function graphWithGuides(guides: SceneNode['guides']): SceneGraph {
   const page = {
     id: 'page',
+    childIds: [],
     guides
   } as SceneNode
   return {