diff --git a/src/pages/tldraw/singlePlayerPage.tsx b/src/pages/tldraw/singlePlayerPage.tsx
index cd0a740..688963b 100644
--- a/src/pages/tldraw/singlePlayerPage.tsx
+++ b/src/pages/tldraw/singlePlayerPage.tsx
@@ -98,6 +98,9 @@ export default function SinglePlayerPage() {
                     shapeUtils: allShapeUtils,
                     bindingUtils: allBindingUtils
                 });
+                // Pre-initialize tldraw's required records (TLINSTANCE, page, cameras)
+                // so computed signals that read currentPageId don't crash before Editor construction completes
+                (newStore as unknown as { ensureStoreIsUsable(): void }).ensureStoreIsUsable();
 
                 const snapSvc = new NavigationSnapshotService(newStore, editorRef.current || undefined);
                 if (accessToken) snapSvc.setAccessToken(accessToken);