diff --git a/BBWY.Server.Business/Statistics/StatisticsBusiness.cs b/BBWY.Server.Business/Statistics/StatisticsBusiness.cs
index c385d042..e12642dc 100644
--- a/BBWY.Server.Business/Statistics/StatisticsBusiness.cs
+++ b/BBWY.Server.Business/Statistics/StatisticsBusiness.cs
@@ -62,7 +62,7 @@ namespace BBWY.Server.Business
                                                                                   o.StartTime <= pularizeEndTime)
                                                                 .GroupBy((o, oc) => new
                                                                 {
-                                                                    IsSD = o.StorageType == Enums.StorageType.SD
+                                                                    IsSD = o.StorageType != null && o.StorageType == Enums.StorageType.SD
                                                                 })
                                                                 .ToList(g => new
                                                                 {