From 40d09b7ad1bb5e785b7c8be3f04ac923043545ca Mon Sep 17 00:00:00 2001
From: Christoph Brand <>
Date: Tue, 4 Oct 2022 09:07:13 +0200
Subject: [PATCH] fix: skip null txt record

Do not try to send a txt record when information for sending
it out is missing. Before this if there was a TXT record request
it did raise an Exception instead of just not returning
the information.
---
 src/mdns_client/responder.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/mdns_client/responder.py b/src/mdns_client/responder.py
index 37ffef5..e64a702 100644
--- a/src/mdns_client/responder.py
+++ b/src/mdns_client/responder.py
@@ -169,8 +169,12 @@ def _on_txt_question(self, question: DNSQuestion) -> None:
         if service is None:
             return
 
+        txt_record = self._txt_record_for(service)
+        if txt_record is None:
+            return
+
         self._dprint("Responding to DNS TXT question for {}".format(query))
-        srv_answers = [self._txt_record_for(service)]
+        srv_answers = [txt_record]
         self._send_response(srv_answers)
 
     def _get_service_of(self, query: str) -> "Optional[str]":