diff --git a/src/widgets/kernel/qapplication.cpp b/src/widgets/kernel/qapplication.cpp
index dc09155438..803d1efc0d 100644
--- a/src/widgets/kernel/qapplication.cpp
+++ b/src/widgets/kernel/qapplication.cpp
@@ -2978,7 +2978,8 @@ bool QApplication::notify(QObject *receiver, QEvent *e)
     d->checkReceiverThread(receiver);
 #endif
 
-    QGuiApplicationPrivate::sendQWindowEventToQPlatformWindow(qobject_cast<QWindow *>(receiver), e);
+    if (receiver->isWindowType())
+        QGuiApplicationPrivate::sendQWindowEventToQPlatformWindow(static_cast<QWindow *>(receiver), e);
 
     // capture the current mouse/keyboard state
     if(e->spontaneous()) {