Having issues with the Serial Monitor needing to be opened for my entire code to work

[JohnRob]

@GrubbyDinner

// Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

I've not tried it but if there is no serial monitor the code will wait forever.