diff --git a/backend/app/admin/crud/crud_user.py b/backend/app/admin/crud/crud_user.py
index b75c8d04..8f79df54 100644
--- a/backend/app/admin/crud/crud_user.py
+++ b/backend/app/admin/crud/crud_user.py
@@ -87,6 +87,7 @@ async def add_by_oauth2(self, db: AsyncSession, obj: AddOAuth2UserParam) -> None
         :param obj: 注册用户参数
         :return:
         """
+        obj.avatar = str(obj.avatar)  # noqa: fix pgsql compatibility
         dict_obj = obj.model_dump()
         dict_obj.update({'is_staff': True, 'salt': None})
         new_user = self.model(**dict_obj)
@@ -108,6 +109,8 @@ async def update(self, db: AsyncSession, input_user: User, obj: UpdateUserParam)
         """
         role_ids = obj.roles
         del obj.roles
+
+        obj.avatar = str(obj.avatar)  # noqa: fix pgsql compatibility
         count = await self.update_model(db, input_user.id, obj)
 
         stmt = select(Role).where(Role.id.in_(role_ids))