From 16941420c93f11f7480f6be47006419296a234f2 Mon Sep 17 00:00:00 2001
From: Alexandre Mutel <alexandre_mutel@live.com>
Date: Fri, 21 Jan 2022 05:29:40 +0100
Subject: [PATCH] Fixed NullReferenceException when accessing
 FieldDescriptor.IsPacked

---
 csharp/src/Google.Protobuf/Reflection/FieldDescriptor.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/csharp/src/Google.Protobuf/Reflection/FieldDescriptor.cs b/csharp/src/Google.Protobuf/Reflection/FieldDescriptor.cs
index f9b90619adb5..51d87353135d 100644
--- a/csharp/src/Google.Protobuf/Reflection/FieldDescriptor.cs
+++ b/csharp/src/Google.Protobuf/Reflection/FieldDescriptor.cs
@@ -239,7 +239,8 @@ public bool IsPacked
                 }
                 else
                 {
-                    return !Proto.Options.HasPacked || Proto.Options.Packed;
+                    // Packed by default with proto3
+                    return Proto.Options == null || !Proto.Options.HasPacked || Proto.Options.Packed;
                 }
             }
         }