diff --git a/src/gui/kernel/qwindow.cpp b/src/gui/kernel/qwindow.cpp
index b59c32ac343..1e30e57baf2 100644
--- a/src/gui/kernel/qwindow.cpp
+++ b/src/gui/kernel/qwindow.cpp
@@ -687,6 +687,7 @@ void QWindow::create()
     Returns the window's platform id.
 
     \note This function will cause the platform window to be created if it is not already.
+    Returns 0, if the platform window creation failed.
 
     For platforms where this id might be useful, the value returned
     will uniquely represent the window inside the corresponding screen.
@@ -700,6 +701,9 @@ WId QWindow::winId() const
     if (!d->platformWindow)
         const_cast<QWindow *>(this)->create();
 
+    if (!d->platformWindow)
+        return 0;
+
     return d->platformWindow->winId();
 }