From a39162749c6c4328336cb2e38dcd165b3ca82cbb Mon Sep 17 00:00:00 2001
From: Shreyas Zare <shreyas@technitium.com>
Date: Sun, 27 Mar 2022 14:41:37 +0530
Subject: [PATCH] DnsResourceRecordInfo: fixed issue of missing null check
 causing error when saving SOA record without comments or when changing server
 name.

---
 DnsServerCore/Dns/ResourceRecords/DnsResourceRecordInfo.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/DnsServerCore/Dns/ResourceRecords/DnsResourceRecordInfo.cs b/DnsServerCore/Dns/ResourceRecords/DnsResourceRecordInfo.cs
index 8055c1e1..a1ffd11a 100644
--- a/DnsServerCore/Dns/ResourceRecords/DnsResourceRecordInfo.cs
+++ b/DnsServerCore/Dns/ResourceRecords/DnsResourceRecordInfo.cs
@@ -222,7 +222,7 @@ namespace DnsServerCore.Dns.ResourceRecords
             get { return _comments; }
             set
             {
-                if (value.Length > 255)
+                if ((value is not null) && (value.Length > 255))
                     throw new ArgumentOutOfRangeException(nameof(Comments), "Resource record comment text cannot exceed 255 characters.");
 
                 _comments = value;