diff --git a/hiddifypanel/models/__init__.py b/hiddifypanel/models/__init__.py
index 1028bee48..6d280546f 100644
--- a/hiddifypanel/models/__init__.py
+++ b/hiddifypanel/models/__init__.py
@@ -1,4 +1,4 @@
-from .config_enum import ConfigCategory, ConfigEnum
+from .config_enum import ConfigCategory, ConfigEnum,Lang
 from .config import StrConfig, BoolConfig, get_hconfigs, hconfig, set_hconfig, add_or_update_config, bulk_register_configs
 
 from .parent_domain import ParentDomain, add_or_update_parent_domains, bulk_register_parent_domains
diff --git a/hiddifypanel/models/config_enum.py b/hiddifypanel/models/config_enum.py
index 1378cab79..f96f7a540 100644
--- a/hiddifypanel/models/config_enum.py
+++ b/hiddifypanel/models/config_enum.py
@@ -2,7 +2,13 @@
 
 from strenum import StrEnum
 
-
+class Lang(StrEnum):
+    en = auto()
+    fa = auto()
+    ru = auto()
+    pt = auto()
+    zh = auto()
+    
 class ConfigCategory(StrEnum):
     admin = auto()
     branding = auto()
diff --git a/hiddifypanel/models/user.py b/hiddifypanel/models/user.py
index 31785907e..1d90d5246 100644
--- a/hiddifypanel/models/user.py
+++ b/hiddifypanel/models/user.py
@@ -7,6 +7,7 @@
 from strenum import StrEnum
 
 from hiddifypanel.panel.database import db
+from hiddifypanel.models import Lang
 
 ONE_GIG = 1024*1024*1024
 
@@ -24,12 +25,7 @@ class UserMode(StrEnum):
     daily = auto()
 
     # disable = auto()
-class UserLang(StrEnum):
-    en = auto()
-    fa = auto()
-    ru = auto()
-    pt = auto()
-    zh = auto()
+
 
 class UserDetail(db.Model, SerializerMixin):
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
@@ -76,7 +72,7 @@ class User(db.Model, SerializerMixin):
     max_ips = db.Column(db.Integer, default=1000, nullable=False)
     details = db.relationship('UserDetail', cascade="all,delete", backref='user',    lazy='dynamic',)
     enable = db.Column(db.Boolean, default=True, nullable=False)
-    lang = db.Column(db.Enum(UserLang),nullable=False, default='en')
+    lang = db.Column(db.Enum(Lang), default=None)
     ed25519_private_key = db.Column(db.String(500))
     ed25519_public_key = db.Column(db.String(100))
 
diff --git a/hiddifypanel/panel/commercial/restapi/v2/user/DTO.py b/hiddifypanel/panel/commercial/restapi/v2/user/DTO.py
index 7fc84ac39..870bf4432 100644
--- a/hiddifypanel/panel/commercial/restapi/v2/user/DTO.py
+++ b/hiddifypanel/panel/commercial/restapi/v2/user/DTO.py
@@ -3,13 +3,8 @@
 from apiflask.validators import Length, OneOf
 from strenum import StrEnum
 from enum import auto
+from hiddifypanel.models import Lang
 
-class SupportedLanuges(StrEnum):
-    en = auto()
-    fa = auto()
-    ru = auto()
-    pt = auto()
-    zh = auto()
 
 class ProfileDTO(Schema):
     profile_title = String(required=True)
@@ -25,7 +20,7 @@ class ProfileDTO(Schema):
     brand_title = String()
     brand_icon_url = URL()
     doh = URL()
-    lang = Enum(SupportedLanuges,required=True)
+    lang = Enum(Lang,required=True)
 
 class ConfigDTO(Schema):
     name = String(required=True)
@@ -46,5 +41,5 @@ class ShortDTO(Schema):
     full_url = String(required=True)
 
 class UserInfoChangableDTO(Schema):
-    language = Enum(SupportedLanuges,required=False)
+    language = Enum(Lang,required=False)
     telegram_id = Integer(required=False)
\ No newline at end of file
diff --git a/hiddifypanel/panel/commercial/restapi/v2/user/user.py b/hiddifypanel/panel/commercial/restapi/v2/user/user.py
index c2ca4adf0..17330b49f 100644
--- a/hiddifypanel/panel/commercial/restapi/v2/user/user.py
+++ b/hiddifypanel/panel/commercial/restapi/v2/user/user.py
@@ -46,7 +46,7 @@ def get(self):
         dto.brand_title = hconfig(ConfigEnum.branding_title)
         dto.brand_icon_url = ""
         dto.doh = f"https://{urlparse(request.base_url).hostname}/{g.proxy_path}/dns/dns-query"
-        dto.lang = c['user'].lang
+        dto.lang = c['user'].lang if c['user'].lang else hconfig(ConfigEnum.lang)
         return dto
 
     @app.input(UserInfoChangableDTO,arg_name='data')
@@ -65,6 +65,8 @@ def patch(self,data):
             
         if data['language']:
             user = user_by_uuid(g.user_uuid)
+            if user.lang is None:
+                user.lang = hconfig(ConfigEnum.lang)
             if user.lang != data['language']:
                 user.lang = data['language']
                 db.session.commit()