diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 68715413d17..cb2e9e0becd 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -12272,7 +12272,7 @@ QPoint QWidget::mapToGlobal(const QPoint &pos) const
 {
 #ifndef QT_NO_GRAPHICSVIEW
     Q_D(const QWidget);
-    if (d->extra && d->extra->proxyWidget) {
+    if (d->extra && d->extra->proxyWidget && d->extra->proxyWidget->scene()) {
         const QList <QGraphicsView *> views = d->extra->proxyWidget->scene()->views();
         if (!views.isEmpty()) {
             const QPointF scenePos = d->extra->proxyWidget->mapToScene(pos);
@@ -12307,7 +12307,7 @@ QPoint QWidget::mapFromGlobal(const QPoint &pos) const
 {
 #ifndef QT_NO_GRAPHICSVIEW
     Q_D(const QWidget);
-    if (d->extra && d->extra->proxyWidget) {
+    if (d->extra && d->extra->proxyWidget && d->extra->proxyWidget->scene()) {
         const QList <QGraphicsView *> views = d->extra->proxyWidget->scene()->views();
         if (!views.isEmpty()) {
             const QPoint viewPortPos = views.first()->viewport()->mapFromGlobal(pos);
diff --git a/tests/auto/widgets/graphicsview/qgraphicsproxywidget/tst_qgraphicsproxywidget.cpp b/tests/auto/widgets/graphicsview/qgraphicsproxywidget/tst_qgraphicsproxywidget.cpp
index 5aea845f90d..3913f204ba3 100644
--- a/tests/auto/widgets/graphicsview/qgraphicsproxywidget/tst_qgraphicsproxywidget.cpp
+++ b/tests/auto/widgets/graphicsview/qgraphicsproxywidget/tst_qgraphicsproxywidget.cpp
@@ -175,6 +175,7 @@ private slots:
     void windowFrameMargins();
     void QTBUG_6986_sendMouseEventToAlienWidget();
     void mapToGlobal();
+    void mapToGlobalWithoutScene();
     void QTBUG_43780_visibility();
 };
 
@@ -3690,6 +3691,16 @@ void tst_QGraphicsProxyWidget::mapToGlobal() // QTBUG-41135
                         .arg(embeddedCenterGlobal.x()).arg(embeddedCenterGlobal.y())));
 }
 
+void tst_QGraphicsProxyWidget::mapToGlobalWithoutScene() // QTBUG-44509
+{
+    QGraphicsProxyWidget proxyWidget;
+    QWidget *embeddedWidget = new QWidget;
+    proxyWidget.setWidget(embeddedWidget);
+    const QPoint localPos(0, 0);
+    const QPoint globalPos = embeddedWidget->mapToGlobal(localPos);
+    QCOMPARE(embeddedWidget->mapFromGlobal(globalPos), localPos);
+}
+
 // QTBUG_43780: Embedded widgets have isWindow()==true but showing them should not
 // trigger the top-level widget code path of show() that closes all popups
 // (for example combo popups).