diff --git a/video-gen-api/app/middleware/request_encrypt.py b/video-gen-api/app/middleware/request_encrypt.py
index 0d4113ed..cf021bf4 100644
--- a/video-gen-api/app/middleware/request_encrypt.py
+++ b/video-gen-api/app/middleware/request_encrypt.py
@@ -3,7 +3,7 @@ import json
 import logging
 
 from cryptography.hazmat.primitives.ciphers.aead import AESGCM
-from fastapi import Request, Response
+from fastapi import HTTPException, Request, Response
 from starlette.middleware.base import BaseHTTPMiddleware, RequestResponseEndpoint
 
 from app.config import settings
@@ -98,6 +98,9 @@ class RequestEncryptMiddleware(BaseHTTPMiddleware):
                 status_code=response.status_code,
                 headers={"X-Encrypted": "true", "Content-Type": "application/json"},
             )
+        except HTTPException:
+            # 让 HTTPException（如 409 订单占用）正常传播，不被加密中间件拦截
+            raise
         except Exception:
             logger.exception("Request decryption failed")
             return Response(