diff --git a/src/WMS.Web.Domain/Services/SerialNumberService.cs b/src/WMS.Web.Domain/Services/SerialNumberService.cs
index a7230e0d..805e436f 100644
--- a/src/WMS.Web.Domain/Services/SerialNumberService.cs
+++ b/src/WMS.Web.Domain/Services/SerialNumberService.cs
@@ -382,9 +382,9 @@ namespace WMS.Web.Domain.Services
             List<SerialNumberOperate> sList = new List<SerialNumberOperate>();
             foreach (var entity in entityList)
             {
-                var box = boxList.FirstOrDefault(f => f.Id == entity.BoxId);
                 var detail = backRecord.Details.FirstOrDefault(w => w.SerialNumbers.Contains(entity.SerialNumber));
-
+                if (detail == null) continue;
+                var box = boxList.FirstOrDefault(f => f.Id == detail.BoxId);
                 //if (backRecord.Type == BackRecordType.InstockOff)
                 //    entity.UnBind();
                 if (backRecord.Type == BackRecordType.OutstockOn)