QHostInfo::localDomainName() prints QObject::connect(QObject, Unknown): invalid nullptr parameter

#include <QtCore/QtCore>
#include <QtCore/QtCore>
#include <QtNetwork/QHostInfo>
#include <iostream>

int main(int argc, char **argv) { 
  QString domain = QHostInfo::localDomainName(); 
  std::cout << qPrintable(domain) << std::endl;
}

######################################################################
# Automatically generated by qmake (3.1) Fri Mar 4 21:26:01 2022
######################################################################
TEMPLATE = app
TARGET = domainname
INCLUDEPATH += .
QT += network
# You can make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# Please consult the documentation of the deprecated API in order to know
# how to port your code away from it.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0# Input
SOURCES += main.cpp

qmake-qt5 -project
qmake-qt5
make

[kevin_constantine@instance-1 domainname]$ ./domainname
QObject::connect(QObject, Unknown): invalid nullptr parameter
c.gcp-project.internal