From 9f38df342f8e3313e8b95c19e1fbe986a0e76d43 Mon Sep 17 00:00:00 2001
From: sjh00 <sjh00@outlook.com>
Date: Mon, 20 Oct 2025 13:53:24 +0800
Subject: [PATCH] fix: PageCollector -> TypeError: Cannot set properties of
 undefined

---
 src/PageCollector.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/PageCollector.ts b/src/PageCollector.ts
index b6b3d679..f7a81446 100644
--- a/src/PageCollector.ts
+++ b/src/PageCollector.ts
@@ -91,7 +91,12 @@ export class PageCollector<T> {
     this.storage.set(page, storedLists);
 
     const listeners = this.#listenersInitializer(value => {
-      const withId = value as WithSymbolId<T>;
+      let withId: WithSymbolId<T>;
+      if (value === undefined || value === null) {
+        withId = {} as WithSymbolId<T>;
+      } else {
+        withId = value as WithSymbolId<T>;
+      }
       withId[stableIdSymbol] = idGenerator();
 
       const navigations = this.storage.get(page) ?? [[]];