diff --git a/src/app/(features)/dictionary/DictionaryClient.tsx b/src/app/(features)/dictionary/DictionaryClient.tsx
index 910a9f9..b213d59 100644
--- a/src/app/(features)/dictionary/DictionaryClient.tsx
+++ b/src/app/(features)/dictionary/DictionaryClient.tsx
@@ -90,11 +90,11 @@ export function DictionaryClient({ initialFolders }: DictionaryClientProps) {
     const folderSelect = document.getElementById("folder-select") as HTMLSelectElement;
     const folderId = folderSelect?.value ? Number(folderSelect.value) : folders[0]?.id;
 
-    if (!searchResult) return;
+    if (!searchResult?.entries?.length) return;
 
-    const definition = searchResult.entries.reduce((p, e) => {
-      return { ...p, definition: p.definition + ' | ' + e.definition };
-    }).definition;
+    const definition = searchResult.entries
+      .map((e) => e.definition)
+      .join(" | ");
 
     try {
       await actionCreatePair({
@@ -102,7 +102,7 @@ export function DictionaryClient({ initialFolders }: DictionaryClientProps) {
         text2: definition,
         language1: queryLang,
         language2: definitionLang,
-        ipa1: searchResult.entries[0].ipa,
+        ipa1: searchResult.entries[0]?.ipa,
         folderId: folderId,
       });
 
diff --git a/src/app/(features)/srt-player/utils/subtitleParser.ts b/src/app/(features)/srt-player/utils/subtitleParser.ts
index b49eba6..17246df 100644
--- a/src/app/(features)/srt-player/utils/subtitleParser.ts
+++ b/src/app/(features)/srt-player/utils/subtitleParser.ts
@@ -62,13 +62,12 @@ export function getNearestIndex(
 ): number | null {
   for (let i = 0; i < subtitles.length; i++) {
     const subtitle = subtitles[i];
-    const isBefore = currentTime - subtitle.start >= 0;
-    const isAfter = currentTime - subtitle.end >= 0;
+    const isWithin = currentTime >= subtitle.start && currentTime <= subtitle.end;
     
-    if (!isBefore || !isAfter) return i - 1;
-    if (isBefore && !isAfter) return i;
+    if (isWithin) return i;
+    if (currentTime < subtitle.start) return i > 0 ? i - 1 : null;
   }
-  return null;
+  return subtitles.length > 0 ? subtitles.length - 1 : null;
 }
 
 export function getCurrentSubtitle(
diff --git a/src/app/(features)/text-speaker/SaveList.tsx b/src/app/(features)/text-speaker/SaveList.tsx
index 98674f5..a031bb5 100644
--- a/src/app/(features)/text-speaker/SaveList.tsx
+++ b/src/app/(features)/text-speaker/SaveList.tsx
@@ -60,11 +60,12 @@ export function SaveList({ show = false, handleUse }: SaveListProps) {
   const [data, setData] = useState(getFromLocalStorage());
   const handleDel = (item: z.infer<typeof TextSpeakerItemSchema>) => {
     const current_data = getFromLocalStorage();
+    if (!current_data) return;
 
-    current_data.splice(
-      current_data.findIndex((v) => v.text === item.text),
-      1,
-    );
+    const index = current_data.findIndex((v) => v.text === item.text);
+    if (index === -1) return;
+    
+    current_data.splice(index, 1);
     setIntoLocalStorage(current_data);
     refresh();
   };
@@ -78,33 +79,25 @@ export function SaveList({ show = false, handleUse }: SaveListProps) {
       refresh();
     }
   };
-  if (show)
+  if (show && data)
     return (
       <div
         className="my-4 p-2 mx-4 md:mx-32 border border-gray-200 rounded-lg"
-        style={{ fontFamily: "Times New Roman, serif" }}
       >
-        <div className="flex flex-row justify-center gap-8 items-center">
-          <IconClick
-            src={IMAGES.refresh}
-            alt="refresh"
-            onClick={refresh}
-            size="lg"
-            className=""
-          ></IconClick>
-          <IconClick
-            src={IMAGES.delete}
-            alt="delete"
+        <div className="flex justify-between items-center mb-2">
+          <p className="text-sm text-gray-600">{t("saved")}</p>
+          <button
             onClick={handleDeleteAll}
-            size="lg"
-            className=""
-          ></IconClick>
+            className="text-xs text-gray-500 hover:text-gray-800"
+          >
+            {t("clearAll")}
+          </button>
         </div>
-        <ul>
-          {data.map((v) => (
+        <ul className="divide-y divide-gray-100">
+          {data.map((item, i) => (
             <TextCard
-              item={v}
-              key={crypto.randomUUID()}
+              key={i}
+              item={item}
               handleUse={handleUse}
               handleDel={handleDel}
             ></TextCard>
diff --git a/src/app/(features)/text-speaker/page.tsx b/src/app/(features)/text-speaker/page.tsx
index d683e47..9bfdc89 100644
--- a/src/app/(features)/text-speaker/page.tsx
+++ b/src/app/(features)/text-speaker/page.tsx
@@ -48,8 +48,8 @@ export default function TextSpeakerPage() {
     const handleEnded = () => {
       if (autopause) {
         setPause(true);
-      } else {
-        load(objurlRef.current!);
+      } else if (objurlRef.current) {
+        load(objurlRef.current);
         play();
       }
     };
@@ -187,7 +187,7 @@ export default function TextSpeakerPage() {
         theIPA = tmp_ipa;
       }
 
-      const save = getFromLocalStorage();
+      const save = getFromLocalStorage() ?? [];
       const oldIndex = save.findIndex((v) => v.text === textRef.current);
       if (oldIndex !== -1) {
         const oldItem = save[oldIndex];
@@ -293,7 +293,7 @@ export default function TextSpeakerPage() {
             size="lg"
             onClick={() => {
               setAutopause(!autopause);
-              if (objurlRef) {
+              if (objurlRef.current) {
                 stop();
               }
               setPause(true);
diff --git a/src/app/folders/[folder_id]/InFolder.tsx b/src/app/folders/[folder_id]/InFolder.tsx
index f13a3c2..d757653 100644
--- a/src/app/folders/[folder_id]/InFolder.tsx
+++ b/src/app/folders/[folder_id]/InFolder.tsx
@@ -26,10 +26,14 @@ export function InFolder({ folderId, isReadOnly }: { folderId: number; isReadOnl
       setLoading(true);
       await actionGetPairsByFolderId(folderId)
         .then(result => {
-          if (!result.success || !result.data) throw result.message;
+          if (!result.success || !result.data) {
+            throw new Error(result.message || "Failed to load text pairs");
+          }
           return result.data;
         }).then(setTextPairs)
-        .catch(toast.error)
+        .catch((error) => {
+          toast.error(error instanceof Error ? error.message : "Unknown error");
+        })
         .finally(() => {
           setLoading(false);
         });
@@ -40,10 +44,14 @@ export function InFolder({ folderId, isReadOnly }: { folderId: number; isReadOnl
   const refreshTextPairs = async () => {
     await actionGetPairsByFolderId(folderId)
       .then(result => {
-        if (!result.success || !result.data) throw result.message;
+        if (!result.success || !result.data) {
+          throw new Error(result.message || "Failed to refresh text pairs");
+        }
         return result.data;
       }).then(setTextPairs)
-      .catch(toast.error);
+      .catch((error) => {
+        toast.error(error instanceof Error ? error.message : "Unknown error");
+      });
   };
 
   return (
@@ -119,9 +127,11 @@ export function InFolder({ folderId, isReadOnly }: { folderId: number; isReadOnl
                   onDel={() => {
                     actionDeletePairById(textPair.id)
                       .then(result => {
-                        if (!result.success) throw result.message;
+                        if (!result.success) throw new Error(result.message || "Delete failed");
                       }).then(refreshTextPairs)
-                      .catch(toast.error);
+                      .catch((error) => {
+                        toast.error(error instanceof Error ? error.message : "Unknown error");
+                      });
                   }}
                   refreshTextPairs={refreshTextPairs}
                 />
diff --git a/src/lib/bigmodel/zhipu.ts b/src/lib/bigmodel/zhipu.ts
index e617750..0892459 100644
--- a/src/lib/bigmodel/zhipu.ts
+++ b/src/lib/bigmodel/zhipu.ts
@@ -47,7 +47,12 @@ async function getAnswer(prompt: string | Messages): Promise<string> {
     : prompt;
 
   const response = await callZhipuAPI(messages);
-  return response.choices[0].message.content.trim() as string;
+  
+  if (!response.choices?.[0]?.message?.content) {
+    throw new Error("AI API 返回空响应");
+  }
+  
+  return response.choices[0].message.content.trim();
 }
 
 export { getAnswer };
diff --git a/src/lib/browser/localStorageOperators.ts b/src/lib/browser/localStorageOperators.ts
index 6139cd5..240ee1b 100644
--- a/src/lib/browser/localStorageOperators.ts
+++ b/src/lib/browser/localStorageOperators.ts
@@ -1,7 +1,9 @@
+"use client";
+
 import { z } from "zod";
 
 interface LocalStorageOperator<T> {
-  get: () => T;
+  get: () => T | null;
   set: (value: T) => void;
 }
 
@@ -9,22 +11,29 @@ export function getLocalStorageOperator<T extends z.ZodType>(
   key: string,
   schema: T
 ): LocalStorageOperator<z.infer<T>> {
-  const get = (): z.infer<T> => {
+  const get = (): z.infer<T> | null => {
     if (typeof window === "undefined") {
-      return [] as unknown as z.infer<T>;
+      return null;
     }
 
     try {
       const item = localStorage.getItem(key);
       if (item === null) {
-        return [] as unknown as z.infer<T>;
+        return null;
       }
 
       const parsed = JSON.parse(item);
-      return schema.parse(parsed);
+      const result = schema.safeParse(parsed);
+      
+      if (!result.success) {
+        console.warn(`[localStorage] Schema validation failed for key "${key}":`, result.error.message);
+        return null;
+      }
+      
+      return result.data;
     } catch (error) {
-      console.error(`Error reading from localStorage key "${key}":`, error);
-      return [] as unknown as z.infer<T>;
+      console.error(`[localStorage] Error reading key "${key}":`, error instanceof Error ? error.message : String(error));
+      return null;
     }
   };
 
@@ -36,7 +45,7 @@ export function getLocalStorageOperator<T extends z.ZodType>(
     try {
       localStorage.setItem(key, JSON.stringify(value));
     } catch (error) {
-      console.error(`Error writing to localStorage key "${key}":`, error);
+      console.error(`[localStorage] Error writing key "${key}":`, error instanceof Error ? error.message : String(error));
     }
   };
 
diff --git a/src/modules/folder/folder-repository.ts b/src/modules/folder/folder-repository.ts
index df3cb27..f046a8f 100644
--- a/src/modules/folder/folder-repository.ts
+++ b/src/modules/folder/folder-repository.ts
@@ -192,8 +192,8 @@ export async function repoGetPublicFolders(
     visibility: folder.visibility,
     createdAt: folder.createdAt,
     userId: folder.userId,
-    userName: folder.user.name,
-    userUsername: folder.user.username,
+    userName: folder.user?.name ?? "Unknown",
+    userUsername: folder.user?.username ?? "unknown",
     totalPairs: folder._count.pairs,
     favoriteCount: folder._count.favorites,
   }));
@@ -221,8 +221,8 @@ export async function repoSearchPublicFolders(
     visibility: folder.visibility,
     createdAt: folder.createdAt,
     userId: folder.userId,
-    userName: folder.user.name,
-    userUsername: folder.user.username,
+    userName: folder.user?.name ?? "Unknown",
+    userUsername: folder.user?.username ?? "unknown",
     totalPairs: folder._count.pairs,
     favoriteCount: folder._count.favorites,
   }));
@@ -300,8 +300,8 @@ export async function repoGetUserFavorites(input: RepoInputGetUserFavorites) {
     folderCreatedAt: fav.folder.createdAt,
     folderTotalPairs: fav.folder._count.pairs,
     folderOwnerId: fav.folder.userId,
-    folderOwnerName: fav.folder.user.name,
-    folderOwnerUsername: fav.folder.user.username,
+    folderOwnerName: fav.folder.user?.name ?? "Unknown",
+    folderOwnerUsername: fav.folder.user?.username ?? "unknown",
     favoritedAt: fav.createdAt,
   }));
 }