diff --git a/src/helpers/detect-device.ts b/src/helpers/detect-device.ts
index 4a9e516..e50f74e 100644
--- a/src/helpers/detect-device.ts
+++ b/src/helpers/detect-device.ts
@@ -8,7 +8,7 @@ export const windowIsDefined = () => {
 
 export const getDevice = (): 'mobile' | 'pc' => {
   return windowIsDefined() &&
-    /Android|webOS|iPhone|iPod|BlackBerry/i.test(window.navigator.userAgent)
+    /Android|webOS|iPhone|iPod|BlackBerry/i.test(window.navigator?.userAgent)
     ? 'mobile'
     : 'pc';
 };
diff --git a/src/i18n/language.ts b/src/i18n/language.ts
index 87f5c90..7cbabaf 100644
--- a/src/i18n/language.ts
+++ b/src/i18n/language.ts
@@ -1,3 +1,4 @@
+import { windowIsDefined } from '@/helpers/detect-device';
 import { getSearchObj } from '@/helpers/location';
 
 /**
@@ -5,7 +6,10 @@ import { getSearchObj } from '@/helpers/location';
  */
 export function getLanguage(): string {
   const query = getSearchObj();
-  const lang = (query.lang as string) || navigator.language || 'zh-CN';
+  const lang =
+    (query.lang as string) ||
+    (windowIsDefined() ? navigator?.language : 'zh-CN') ||
+    'zh-CN';
   typeof document !== 'undefined' && document.body.setAttribute('lang', lang);
   return lang;
 }