From e20f64fa9a3d662282b45b2aea289e26991568be Mon Sep 17 00:00:00 2001
From: Alan Ren <alanren@microsoft.com>
Date: Fri, 16 Dec 2022 08:08:00 -0800
Subject: [PATCH] handle null value (#1790)

---
 .../QueryExecution/DataStorage/ServiceBufferFileStreamWriter.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Microsoft.SqlTools.ServiceLayer/QueryExecution/DataStorage/ServiceBufferFileStreamWriter.cs b/src/Microsoft.SqlTools.ServiceLayer/QueryExecution/DataStorage/ServiceBufferFileStreamWriter.cs
index b57ba636..e6c454f3 100644
--- a/src/Microsoft.SqlTools.ServiceLayer/QueryExecution/DataStorage/ServiceBufferFileStreamWriter.cs
+++ b/src/Microsoft.SqlTools.ServiceLayer/QueryExecution/DataStorage/ServiceBufferFileStreamWriter.cs
@@ -174,7 +174,7 @@ namespace Microsoft.SqlTools.ServiceLayer.QueryExecution.DataStorage
                 }
 
                 // Get true type of the object
-                Type tVal = values[i].GetType();
+                Type tVal = values[i] == null ? typeof(DBNull) : values[i].GetType();
 
                 // Write the object to a file
                 if (tVal == typeof(DBNull))