begin function crashes

[lunard]

Hello, my name is Luca from Italy.
Thanks a lot for your nice example !
I'm using a M5StickC Plus and the line

mySerial->begin(19200);

causes a crash of the ESP32.

I'm able to initialise the HardwareSerial using

mySerial->begin(115200, SERIAL_8N1, sw_serial_rx_pin, sw_serial_tx_pin);

With this change, the project compiles and the ESP32 runs it, BUT I have problem by reading data form the TTY Serial:
Serial.available() return always 0.
If i comment the above line (mySerial.begin..), I'm able to read data on the TTY Serial

Do you have any suggestion ?