diff --git a/Document/FAQ.doc b/Document/FAQ.doc
index ce1b6f7..dbe5d90 100644
Binary files a/Document/FAQ.doc and b/Document/FAQ.doc differ
diff --git a/SCADA/Program/DataHelper/DataHelper.cs b/SCADA/Program/DataHelper/DataHelper.cs
index 0025df3..b731f70 100644
--- a/SCADA/Program/DataHelper/DataHelper.cs
+++ b/SCADA/Program/DataHelper/DataHelper.cs
@@ -186,6 +186,7 @@ namespace DatabaseLib
         public static DateTime? GetNullableTime(this DbDataReader reader, int index)
         {
             SqlDataReader dataReader = reader as SqlDataReader;
+            if (dataReader == null) return reader.GetDateTime(index);
             var svr = dataReader.GetSqlDateTime(index);
             return svr.IsNull ? default(Nullable<DateTime>) : svr.Value;
         }