WiFi.ping(ip) freezes mkr1000 if WiFiUdp.h included

[Krong]

WiFi.ping(ip) freezes mkr1000 if WiFiUdp.h included in project.

to show problem - open standard sample WIFI Ping
after
#include <WiFi101.h>
add
#include <WiFiUdp.h>
upload to mkr1000

tested with firmware versions - WINC1501 19.4.4 and latest WINC1501 19.6.1 on two different boards