diff --git a/src/BarCode.Web.Domain/Services/BoxService.cs b/src/BarCode.Web.Domain/Services/BoxService.cs
index 74fc78d..cefa968 100644
--- a/src/BarCode.Web.Domain/Services/BoxService.cs
+++ b/src/BarCode.Web.Domain/Services/BoxService.cs
@@ -469,7 +469,7 @@ namespace BarCode.Web.Domain.Services
                     foreach (var s in bdsList)
                     {
                        var sentity = serialList.FirstOrDefault(f => f.SerialNumber.Equals(s) || f.NumberCode.Equals(s));
-
+                        if (sentity == null) continue;
                         if (sentity.TwoNumberCode.IndexOf(s) >= 0)
                         {