diff --git a/inventory-backend/app/api/v1/common/image_search.py b/inventory-backend/app/api/v1/common/image_search.py
index 568849c..28011d2 100644
--- a/inventory-backend/app/api/v1/common/image_search.py
+++ b/inventory-backend/app/api/v1/common/image_search.py
@@ -240,7 +240,11 @@ def image_search():
                     'sku': r.sku,
                     'barcode': r.barcode,
                     'serial_number': r.serial_number,
-                    'batch_number': r.batch_number,
+                    # ★ stock_product 表没有 batch_number 列（只有采购件/半成品有），
+                    #   直接取 r.batch_number 会 AttributeError 导致整个检索 500。
+                    #   与 stock.py /stocktake/all-items 的既有约定一致，用 serial_number 兜底，
+                    #   保持三个模块回填的字段形状一致。
+                    'batch_number': r.serial_number,
                     'status': r.status,
                     'warehouse_location': r.warehouse_location,
                     'stock_quantity': r.stock_quantity,