I get no output from the card I try to read. When I comment out all lines connected with mysensors library it works

There are no errors
The sketch checks cards id and returns name of the card owner, if it is known, if not "unknown person" is printed on serial. I wanted to send names detected to domoticz, so based on them it would be possible to create an event

0;255;3;0;9;0 MCO:BGN:INIT GW,CP=R-NGA---,REL=255,VER=2.3.1
0;255;3;0;14;Gateway startup complete.
0;255;0;0;17;2.3.1
0;255;3;0;11;USER
0;255;3;0;12;1.1
0;20;0;0;36;
0;255;3;0;9;9 MCO:BGN:STP
0;255;3;0;9;68 MCO:REG:NOT NEEDED
0;255;3;0;9;71 MCO:BGN:INIT OK,TSP=NA```

Hello
I have a problem with sending out data from arduino to controller. Without mySensors everything is working, but when I try to introduce mySensors syntax everything just stops

#define MY_GATEWAY_SERIAL

#include <MySensors.h>  
#include <SPI.h>
#include <MFRC522.h>

#define CHILD_ID_USER 20 
#define SS_PIN 53
#define RST_PIN 5

MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class
 
const byte michal[] = {0xD4,0x9E,0x17,0xA3};
const byte martyna[] = {0x16,0xCF,0x8F,0x12};
MyMessage msgUSER(CHILD_ID_USER, V_TEXT);

void setup() { 
  Serial.begin(115200);
  SPI.begin(); 
  rfid.PCD_Init(); 
}

void presentation()  
{ 
  sendSketchInfo("USER", "1.1");
  present(CHILD_ID_USER, S_INFO);
}
 
void loop() {
  // Look for new cards
  if ( ! rfid.PICC_IsNewCardPresent()) 
    return;
 
  // Verify if the NUID has been readed
  if ( ! rfid.PICC_ReadCardSerial())
    return;
 
  if (rfid.uid.uidByte[0] == michal[0] || 
      rfid.uid.uidByte[1] == michal[1] || 
      rfid.uid.uidByte[2] == michal[2] || 
      rfid.uid.uidByte[3] == michal[3] ) 
     {
          Serial.println("User: Michal");  
          send(msgUSER.set("Michal"),1);
          delay(1500);
          
  }
  else if (rfid.uid.uidByte[0] == martyna[0] || 
           rfid.uid.uidByte[1] == martyna[1] || 
           rfid.uid.uidByte[2] == martyna[2] || 
           rfid.uid.uidByte[3] == martyna[3] )
                {
          Serial.println("User: Martyna");  
          send(msgUSER.set("Martyna"),1);
          delay(1500);
          
  }
  else 
  {
          Serial.println("Niepoprawna karta!!!");
          send(msgUSER.set("Obcy"),1);
          delay(2000);
          
  }
  
  // Halt PICC
  rfid.PICC_HaltA();
 
  // Stop encryption on PCD
  rfid.PCD_StopCrypto1();
}

Meybe someone can see the error in my implementation?