From 7c37346839a8229031ac92f4d56b58d6087e33fa Mon Sep 17 00:00:00 2001
From: mpromonet <michel.promonet@free.fr>
Date: Sun, 4 Oct 2015 17:42:52 +0200
Subject: [PATCH] avoid to dereference a NULL pointer if update is called
 before begin

---
 libraries/ESP8266mDNS/ESP8266mDNS.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/ESP8266mDNS/ESP8266mDNS.cpp b/libraries/ESP8266mDNS/ESP8266mDNS.cpp
index 0767d14e0..687f88623 100644
--- a/libraries/ESP8266mDNS/ESP8266mDNS.cpp
+++ b/libraries/ESP8266mDNS/ESP8266mDNS.cpp
@@ -134,7 +134,7 @@ bool MDNSResponder::begin(const char* domain){
 }
 
 void MDNSResponder::update() {
-  if (!_conn->next()) {
+  if (!_conn || !_conn->next()) {
     return;
   }
   _parsePacket();