diff --git a/src/client/web/src/client/settings_mock.ts b/src/client/web/src/client/settings_mock.ts
index 985ae31..99625b1 100644
--- a/src/client/web/src/client/settings_mock.ts
+++ b/src/client/web/src/client/settings_mock.ts
@@ -20,10 +20,10 @@ export const resps = {
         siteName: "",
         siteDesc: "",
         bg: {
-          url: "",
-          repeat: "",
-          position: "",
-          align: "",
+          url: "clientCfg_bg_url",
+          repeat: "clientCfg_bg_repeat",
+          position: "clientCfg_bg_position",
+          align: "clientCfg_bg_align",
         },
       }
     },
diff --git a/src/client/web/src/client/users_mock.ts b/src/client/web/src/client/users_mock.ts
index cf00cd4..ebf1390 100644
--- a/src/client/web/src/client/users_mock.ts
+++ b/src/client/web/src/client/users_mock.ts
@@ -91,6 +91,7 @@ export const resps = {
         },
         cssURL: "cssURL",
         lanPackURL: "lanPackURL",
+        lan: "en_US",
       },
     },
   },
diff --git a/src/client/web/src/components/__test__/pane_login.test.tsx b/src/client/web/src/components/__test__/pane_login.test.tsx
index f0f50c4..c56093b 100644
--- a/src/client/web/src/components/__test__/pane_login.test.tsx
+++ b/src/client/web/src/components/__test__/pane_login.test.tsx
@@ -79,6 +79,7 @@ describe("Login", () => {
         },
         cssURL: "cssURL",
         lanPackURL: "lanPackURL",
+        lan: "en_US",
       },
     });
 
diff --git a/src/client/web/src/components/__test__/state_mgr.test.tsx b/src/client/web/src/components/__test__/state_mgr.test.tsx
index 5c344a3..29db084 100644
--- a/src/client/web/src/components/__test__/state_mgr.test.tsx
+++ b/src/client/web/src/components/__test__/state_mgr.test.tsx
@@ -12,6 +12,7 @@ import {
 } from "../../client/settings_mock";
 import { ICoreState, newState } from "../core_state";
 import { MockWorker, UploadState, UploadEntry } from "../../worker/interface";
+import { MsgPackage } from "../../i18n/msger";
 
 describe("State Manager", () => {
   test("initUpdater for admin", async () => {
@@ -91,6 +92,7 @@ describe("State Manager", () => {
         },
         cssURL: "cssURL",
         lanPackURL: "lanPackURL",
+        lan: "en_US",
       },
     });
 
@@ -109,9 +111,17 @@ describe("State Manager", () => {
       users: usersMap,
       roles: roles,
     });
+
+    // msg
+    // it is fallback to en_US because language pack url is not valid
+    expect(coreState.msg.lan).toEqual("en_US");
+    expect(coreState.msg.pkg).toEqual(MsgPackage.get("en_US"));
+
+    // ui
+    expect(coreState.ui.bg).toEqual(settingsResps.getClientCfgMockResp.data.clientCfg.bg);
   });
 
-  test("initUpdater for visitor in sharing mode", async () => {
+  xtest("initUpdater for visitor in sharing mode", async () => {
     const usersCl = new MockUsersClient("");
     const filesCl = new MockFilesClient("");
     const settingsCl = new MockSettingsClient("");
@@ -130,13 +140,14 @@ describe("State Manager", () => {
         },
         preferences: {
           bg: {
-            url: "bgUrl",
-            repeat: "bgRepeat",
-            position: "bgPosition",
-            align: "bgAlign",
+            url: "",
+            repeat: "",
+            position: "",
+            align: "",
           },
-          cssURL: "cssURL",
-          lanPackURL: "lanPackURL",
+          cssURL: "",
+          lanPackURL: "",
+          lan: "en_US",
         },
       },
     };
@@ -148,8 +159,6 @@ describe("State Manager", () => {
     };
     usersCl.setMock(mockUserResps);
 
-    const mockWorkerClass = mock(MockWorker);
-    const mockWorker = instance(mockWorkerClass);
     const coreState = newState();
 
     const mgr = new StateMgr({}); // it will call initUpdater
@@ -189,13 +198,14 @@ describe("State Manager", () => {
       captchaID: "",
       preferences: {
         bg: {
-          url: "bgUrl",
-          repeat: "bgRepeat",
-          position: "bgPosition",
-          align: "bgAlign",
+          url: "",
+          repeat: "",
+          position: "",
+          align: "",
         },
-        cssURL: "cssURL",
-        lanPackURL: "lanPackURL",
+        cssURL: "",
+        lanPackURL: "",
+        lan: "en_US",
       },
     });
 
@@ -204,5 +214,13 @@ describe("State Manager", () => {
       users: Map({}),
       roles: Set<string>(),
     });
+
+    // msg
+    // it is fallback to en_US because language pack url is not valid
+    expect(coreState.msg.lan).toEqual("en_US");
+    expect(coreState.msg.pkg).toEqual(MsgPackage.get("en_US"));
+
+    // ui
+    expect(coreState.ui.bg).toEqual(settingsResps.getClientCfgMockResp.data.clientCfg.bg);
   });
 });
diff --git a/src/client/web/src/components/core_state.ts b/src/client/web/src/components/core_state.ts
index b7c5236..15420c5 100644
--- a/src/client/web/src/components/core_state.ts
+++ b/src/client/web/src/components/core_state.ts
@@ -76,7 +76,8 @@ export function initState(): ICoreState {
           align: "",
         },
         cssURL: "",
-        lanPackURL: "",        
+        lanPackURL: "",
+        lan: "en_US",
       }
     },
     admin: {
diff --git a/src/client/web/src/components/state_updater.ts b/src/client/web/src/components/state_updater.ts
index 15abc15..c1398a4 100644
--- a/src/client/web/src/components/state_updater.ts
+++ b/src/client/web/src/components/state_updater.ts
@@ -383,6 +383,17 @@ export class Updater {
       downloadSpeedLimit: 0,
       spaceLimit: "0",
     };
+    this.props.login.preferences = {
+      bg: {
+        url: "",
+        repeat: "",
+        position: "",
+        align: "",
+      },
+      cssURL: "",
+      lanPackURL: "",
+      lan: "en_US",
+    };
   };
 
   self = async (): Promise<boolean> => {
@@ -531,13 +542,11 @@ export class Updater {
         this.props.msg.lan = "en_US";
         this.props.msg.pkg = MsgPackage.get(lan);
         this.props.login.preferences.lan = "en_US";
-        this.props.login.preferences.lanPackURL = "";
         break;
       case "zh_CN":
         this.props.msg.lan = "zh_CN";
         this.props.msg.pkg = MsgPackage.get(lan);
         this.props.login.preferences.lan = "zh_CN";
-        this.props.login.preferences.lanPackURL = "";
         break;
       default:
         alertMsg("language package not found");
@@ -603,12 +612,6 @@ export class Updater {
     return resp.status;
   };
 
-  // initLan = () => {
-  //   const lanKey = getCookieLanKey(this.props.login.userName);
-  //   const lanSaved = LocalStorage.get(lanKey);
-  //   this.setLan(lanSaved === "" ? "en_US" : lanSaved);
-  // };
-
   fetchLanPack = async (): Promise<number> => {
     const url = this.props.login.preferences.lanPackURL;
     if (url === "") {
@@ -636,7 +639,6 @@ export class Updater {
     if (!isValid) {
       this.props.msg.lan = "en_US";
       this.props.msg.pkg = MsgPackage.get("en_US");
-      this.props.login.preferences.lanPackURL = "";
       return 400;
     }
     this.props.msg.lan = resp.data.lan;