diff --git a/src/WMS.Web.Domain/Services/SerialNumberService.cs b/src/WMS.Web.Domain/Services/SerialNumberService.cs
index 805e436f..42b54e99 100644
--- a/src/WMS.Web.Domain/Services/SerialNumberService.cs
+++ b/src/WMS.Web.Domain/Services/SerialNumberService.cs
@@ -385,6 +385,7 @@ namespace WMS.Web.Domain.Services
                 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 (box == null) continue;
                 //if (backRecord.Type == BackRecordType.InstockOff)
                 //    entity.UnBind();
                 if (backRecord.Type == BackRecordType.OutstockOn)