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();