diff --git a/src/order/afdian/factory.py b/src/order/afdian/factory.py
index 27c234f..daa749e 100644
--- a/src/order/afdian/factory.py
+++ b/src/order/afdian/factory.py
@@ -10,6 +10,12 @@
 
 
 async def process_order(out_trade_no: str) -> Tuple[Any, str]:
+    if not out_trade_no:
+        logger.error(
+            f"out_trade_no is reuqired: {out_trade_no}"
+        )
+        return None, "not an order"
+
     response = await query_order_by_out_trade_no(out_trade_no)
     if not response or response.get("ec") != 200:
         logger.error(