diff --git a/src/components/chat/chatStorage.ts b/src/components/chat/chatStorage.ts
index 280b996..46fc1d6 100644
--- a/src/components/chat/chatStorage.ts
+++ b/src/components/chat/chatStorage.ts
@@ -84,7 +84,9 @@ const compareSessionsByAnchorTime = (
   return right.id.localeCompare(left.id);
 };
 
-const toLoadedChatState = (session: ChatSessionRecord | undefined): LoadedChatState => {
+const toLoadedChatState = (
+  session: ChatSessionRecord | undefined,
+): LoadedChatState => {
   if (!session) return emptyLoadedChatState();
   return {
     storageSessionId: session.id,
@@ -107,7 +109,9 @@ const getDb = () =>
   openDB<ChatDB>(CHAT_DB_NAME, CHAT_DB_VERSION, {
     upgrade(db) {
       if (!db.objectStoreNames.contains(SESSION_STORE)) {
-        const sessionStore = db.createObjectStore(SESSION_STORE, { keyPath: "id" });
+        const sessionStore = db.createObjectStore(SESSION_STORE, {
+          keyPath: "id",
+        });
         sessionStore.createIndex("by-updatedAt", "updatedAt");
       }
 
@@ -273,13 +277,17 @@ export const saveActiveChatState = async (
   const finalTitle = preferredTitle || existingSession?.title || "新对话";
   const hasContentChanged =
     !existingSession ||
-    serializeConversationState(existingSession) !== serializeConversationState(state);
+    (existingSession && serializeConversationState(existingSession)) !==
+      serializeConversationState(state);
   const shouldAnchorCreatedAtToFirstMessage =
-    Boolean(existingSession) && !hasChatContent(existingSession) && hasContent;
+    existingSession && !hasChatContent(existingSession) && hasContent;
   const nextRecord: ChatSessionRecord = {
     id: storageSessionId,
     title: finalTitle,
-    isTitleManuallyEdited: state.isTitleManuallyEdited ?? existingSession?.isTitleManuallyEdited ?? false,
+    isTitleManuallyEdited:
+      state.isTitleManuallyEdited ??
+      existingSession?.isTitleManuallyEdited ??
+      false,
     createdAt: shouldAnchorCreatedAtToFirstMessage
       ? now
       : existingSession?.createdAt ?? now,
@@ -360,7 +368,9 @@ export const createEmptyChatSession = async (): Promise<LoadedChatState> => {
   return toLoadedChatState(session);
 };
 
-export const loadChatSessionById = async (sessionId: string): Promise<LoadedChatState> => {
+export const loadChatSessionById = async (
+  sessionId: string,
+): Promise<LoadedChatState> => {
   if (typeof window === "undefined") return emptyLoadedChatState();
 
   await migrateLegacyLocalStorage();
@@ -380,14 +390,18 @@ export const loadChatSessionById = async (sessionId: string): Promise<LoadedChat
   return toLoadedChatState(session);
 };
 
-export const deleteChatSession = async (sessionId: string): Promise<string | undefined> => {
+export const deleteChatSession = async (
+  sessionId: string,
+): Promise<string | undefined> => {
   if (typeof window === "undefined") return undefined;
 
   const db = await getDb();
   await db.delete(SESSION_STORE, sessionId);
 
   const remainingSessions = await db.getAll(SESSION_STORE);
-  const nextActiveSession = remainingSessions.sort(compareSessionsByAnchorTime)[0];
+  const nextActiveSession = remainingSessions.sort(
+    compareSessionsByAnchorTime,
+  )[0];
   const meta = await getMeta();
 
   await setMeta({