diff --git a/app/model/KnowledgeDoc.py b/app/model/KnowledgeDoc.py
index c868159..e17608b 100644
--- a/app/model/KnowledgeDoc.py
+++ b/app/model/KnowledgeDoc.py
@@ -29,7 +29,7 @@ class KnowledgeDocModel(BasicModel, table=True):
   path: str = Field(default=None, description="文档原始文件路径")
   error: Optional[str] = Field(default=None, description="文档处理失败时的错误信息")
   content: Optional[str] = Field(default=None, description="在线可编辑文档内容")
-  code: str = Field(default=None, description="文档编码")
+  code: Optional[str] = Field(default=None, description="文档编码")
 
   # /*---------------------------------------created_by-------------------------------------------*/