diff --git a/client/api/client_data/RecentChat.ts b/client/api/client_data/RecentChat.ts
index 2b1f1be..9406aae 100644
--- a/client/api/client_data/RecentChat.ts
+++ b/client/api/client_data/RecentChat.ts
@@ -1,6 +1,6 @@
 export default class RecentChat {
     declare id: string
     declare title: string
-    declare avatar: string | null
+    declare avatar?: string
     declare content: string
 }
diff --git a/server/data/User.ts b/server/data/User.ts
index 6dcfcba..8cedebd 100644
--- a/server/data/User.ts
+++ b/server/data/User.ts
@@ -106,7 +106,7 @@ export default class User {
         User.database.prepare(`UPDATE ${User.table_name} SET ${key} = ? WHERE count = ?`).run(value, this.bean.count)
         this.bean[key] = value
     }
-    getUserName(): string | null {
+    getUserName() {
         return this.bean.username
     }
     setUserName(userName: string) {
diff --git a/server/data/UserBean.ts b/server/data/UserBean.ts
index b119d1b..37f001c 100644
--- a/server/data/UserBean.ts
+++ b/server/data/UserBean.ts
@@ -2,10 +2,10 @@ export default class UserBean {
     declare count: number
     declare id: string
     declare password: string
-    declare username: string | null
+    declare username?: string
     declare registered_time: number
     declare nickname: string
-    declare avatar_file_hash: string | null
+    declare avatar_file_hash?: string
     declare settings: string
 
     [key: string]: unknown