diff --git a/backend/apps/system/models/user.py b/backend/apps/system/models/user.py
index e5ae8794..0004f057 100644
--- a/backend/apps/system/models/user.py
+++ b/backend/apps/system/models/user.py
@@ -1,4 +1,4 @@
-from typing import List
+from typing import List, Optional
 
 from sqlalchemy import Column, BigInteger
 from sqlalchemy.dialects.postgresql import JSONB
@@ -19,7 +19,11 @@ class BaseUserPO(SQLModel):
     origin: int = Field(nullable=False, default=0)
     create_time: int = Field(default_factory=get_timestamp, sa_type=BigInteger(), nullable=False)
     language: str = Field(max_length=255, default="zh-CN")
-    system_variables: List = Field(sa_column=Column(JSONB, nullable=True))
+    #system_variables: List = Field(sa_column=Column(JSONB, nullable=True))
+    system_variables: Optional[List] = Field(
+        default=None,
+        sa_column=Column(JSONB, nullable=True)
+    )
 
 
 class UserModel(SnowflakeBase, BaseUserPO, table=True):