diff --git a/app/components/home.tsx b/app/components/home.tsx
index 7ed35df..8e4013e 100644
--- a/app/components/home.tsx
+++ b/app/components/home.tsx
@@ -21,7 +21,13 @@ import CloseIcon from "../icons/close.svg";
 import CopyIcon from "../icons/copy.svg";
 import DownloadIcon from "../icons/download.svg";
 
-import { Message, SubmitKey, useChatStore, ChatSession } from "../store";
+import {
+  Message,
+  SubmitKey,
+  useChatStore,
+  ChatSession,
+  BOT_HELLO,
+} from "../store";
 import { showModal, showToast } from "./ui-lib";
 import {
   copyToClipboard,
@@ -307,18 +313,19 @@ export function Chat(props: {
             },
           ]
         : [],
-    ).concat(
-        userInput.length > 0 && config.sendPreviewBubble
-          ? [
-              {
-                role: "user",
-                content: userInput,
-                date: new Date().toLocaleString(),
-                preview: false,
-              },
-            ]
-          : [],
-    ); 
+    )
+    .concat(
+      userInput.length > 0 && config.sendPreviewBubble
+        ? [
+            {
+              role: "user",
+              content: userInput,
+              date: new Date().toLocaleString(),
+              preview: false,
+            },
+          ]
+        : [],
+    );
 
   // auto scroll
   useLayoutEffect(() => {
diff --git a/app/page.tsx b/app/page.tsx
index 54300e7..2ad763c 100644
--- a/app/page.tsx
+++ b/app/page.tsx
@@ -1,4 +1,7 @@
 import { Analytics } from "@vercel/analytics/react";
+
+import "array.prototype.at";
+
 import { Home } from "./components/home";
 
 export default function App() {
diff --git a/app/requests.ts b/app/requests.ts
index a8ba4e9..0be9dbf 100644
--- a/app/requests.ts
+++ b/app/requests.ts
@@ -2,10 +2,6 @@ import type { ChatRequest, ChatReponse } from "./api/openai/typing";
 import { filterConfig, Message, ModelConfig, useAccessStore } from "./store";
 import Locale from "./locales";
 
-if (!Array.prototype.at) {
-  require("array.prototype.at/auto");
-}
-
 const TIME_OUT_MS = 30000;
 
 const makeRequestParam = (
diff --git a/app/store/app.ts b/app/store/app.ts
index e632772..7c2b57f 100644
--- a/app/store/app.ts
+++ b/app/store/app.ts
@@ -11,10 +11,6 @@ import { trimTopic } from "../utils";
 
 import Locale from "../locales";
 
-if (!Array.prototype.at) {
-  require("array.prototype.at/auto");
-}
-
 export type Message = ChatCompletionResponseMessage & {
   date: string;
   streaming?: boolean;
@@ -162,6 +158,11 @@ export interface ChatSession {
 }
 
 const DEFAULT_TOPIC = Locale.Store.DefaultTopic;
+export const BOT_HELLO = {
+  role: "assistant",
+  content: Locale.Store.BotHello,
+  date: "",
+};
 
 function createEmptySession(): ChatSession {
   const createDate = new Date().toLocaleString();
@@ -170,13 +171,7 @@ function createEmptySession(): ChatSession {
     id: Date.now(),
     topic: DEFAULT_TOPIC,
     memoryPrompt: "",
-    messages: [
-      {
-        role: "assistant",
-        content: Locale.Store.BotHello,
-        date: createDate,
-      },
-    ],
+    messages: [],
     stat: {
       tokenCount: 0,
       wordCount: 0,
diff --git a/package.json b/package.json
index 7c6832e..b67d7b0 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
   "dependencies": {
     "@svgr/webpack": "^6.5.1",
     "@vercel/analytics": "^0.1.11",
+    "array.prototype.at": "^1.1.1",
     "emoji-picker-react": "^4.4.7",
     "eventsource-parser": "^0.1.0",
     "fuse.js": "^6.6.2",
@@ -39,7 +40,6 @@
     "@types/react-dom": "^18.0.11",
     "@types/react-katex": "^3.0.0",
     "@types/spark-md5": "^3.0.2",
-    "array.prototype.at": "^1.1.1",
     "cross-env": "^7.0.3",
     "eslint": "^8.36.0",
     "eslint-config-next": "13.2.3",