Error in log - is this a wrong setting?

[cwilmo]

I keep getting this error in my logs over and over:
[2023-07-30 14:08:33 UTC] [10.43.28.1:51302] [UDP] System.NullReferenceException: Object reference not set to an instance of an object.
at TechnitiumLibrary.Net.Dns.DnsDatagram.IsBlockedResponse() in Z:\Technitium\Projects\TechnitiumLibrary\TechnitiumLibrary.Net\Dns\DnsDatagram.cs:line 866
at DnsServerCore.Dns.DnsServer.ProcessRecursiveQueryAsync(DnsDatagram request, IPEndPoint remoteEP, DnsTransportProtocol protocol, IReadOnlyList`1 conditionalForwarders, Boolean dnssecValidation, Boolean cacheRefreshOperation, Boolean skipDnsAppAuthoritativeRequestHandlers) in Z:\Technitium\Projects\DnsServer\DnsServerCore\Dns\DnsServer.cs:line 2594
at DnsServerCore.Dns.DnsServer.ProcessQueryAsync(DnsDatagram request, IPEndPoint remoteEP, DnsTransportProtocol protocol, Boolean isRecursionAllowed, Boolean skipDnsAppAuthoritativeRequestHandlers, String tsigAuthenticatedKeyName) in Z:\Technitium\Projects\DnsServer\DnsServerCore\Dns\DnsServer.cs:line 1149

I am using DoT without blocking to NextDNS with DNSSEC disabled. I changed a number of settings but couldn't get this error to resolve.

[ShreyasZare]

Thanks for reporting this error log. Are you using the latest version 11.3 of the DNS server? Do you get the same error when you use any other forwarder like Quad9, Google or Cloudflare?