After including QtAndroidExtras library can't check if QPointer is NULL

#include <QApplication>
#include <QQmlApplicationEngine>
#include <QPointer>
#include <QDebug>
#include <QtAndroidExtras>
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    QPointer<QObject> pointer;
    if(pointer == NULL) //ERROR HERE
        qDebug() << "TEST";
 
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
 
    return app.exec();
}