diff --git a/backend/common/core/config.py b/backend/common/core/config.py
index ff198247..ba9287ee 100644
--- a/backend/common/core/config.py
+++ b/backend/common/core/config.py
@@ -81,6 +81,6 @@ class Settings(BaseSettings):
     MCP_IMAGE_PATH: str = '/opt/sqlbot/images'
     EXCEL_PATH: str = '/opt/sqlbot/data/excel'
     MCP_IMAGE_HOST: str = 'http://localhost:3000'
-    SERVER_IMAGE_HOST: str
+    SERVER_IMAGE_HOST: str = ''
 
 settings = Settings()  # type: ignore