mdns:  fixed mdns crashing on reception of txt packet without a corresponding service
closes
@@ -2886,7 +2886,7 @@ void mdns_parse_packet(mdns_rx_packet_t * packet)
col = 1;
} else if (!clas) {
col = -1;
- } else {
+ } else if (service) { // only detect txt collision if service existed
col = _mdns_check_txt_collision(service->service, data_ptr, data_len);
}
if (col && !_mdns_server->interfaces[packet->tcpip_if].pcbs[packet->ip_protocol].probe_running) {
