From 95c02402cad2b7f0ce7061bcc49027768856e23b 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

---
 .../esp8266com/esp8266/libraries/ESP8266mDNS/ESP8266mDNS.cpp    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hardware/esp8266com/esp8266/libraries/ESP8266mDNS/ESP8266mDNS.cpp b/hardware/esp8266com/esp8266/libraries/ESP8266mDNS/ESP8266mDNS.cpp
index 0767d14e0f..687f886239 100644
--- a/hardware/esp8266com/esp8266/libraries/ESP8266mDNS/ESP8266mDNS.cpp
+++ b/hardware/esp8266com/esp8266/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();