diff --git a/src/plugins/platforms/qnx/qqnxscreen.cpp b/src/plugins/platforms/qnx/qqnxscreen.cpp
index fc8b3bb167..dfd7ccf0cc 100644
--- a/src/plugins/platforms/qnx/qqnxscreen.cpp
+++ b/src/plugins/platforms/qnx/qqnxscreen.cpp
@@ -151,6 +151,8 @@ QQnxScreen::QQnxScreen(screen_context_t screenContext, screen_display_t display,
 QQnxScreen::~QQnxScreen()
 {
     qScreenDebug() << Q_FUNC_INFO;
+    Q_FOREACH (QQnxWindow *childWindow, m_childWindows)
+        childWindow->setScreen(0);
 
     delete m_cursor;
 }
diff --git a/src/plugins/platforms/qnx/qqnxwindow.cpp b/src/plugins/platforms/qnx/qqnxwindow.cpp
index 43e24034c9..cabbd405e5 100644
--- a/src/plugins/platforms/qnx/qqnxwindow.cpp
+++ b/src/plugins/platforms/qnx/qqnxwindow.cpp
@@ -156,7 +156,8 @@ QQnxWindow::~QQnxWindow()
 
     // Remove from parent's Hierarchy.
     removeFromParent();
-    m_screen->updateHierarchy();
+    if (m_screen)
+        m_screen->updateHierarchy();
 
     // Cleanup QNX window and its buffers
     screen_destroy_window(m_window);
@@ -497,6 +498,11 @@ void QQnxWindow::setScreen(QQnxScreen *platformScreen)
 {
     qWindowDebug() << Q_FUNC_INFO << "window =" << window() << "platformScreen =" << platformScreen;
 
+    if (platformScreen == 0) { // The screen has been destroyed
+        m_screen = 0;
+        return;
+    }
+
     if (m_screen == platformScreen)
         return;
 
@@ -539,7 +545,7 @@ void QQnxWindow::removeFromParent()
             m_parentWindow = 0;
         else
             qFatal("QQnxWindow: Window Hierarchy broken; window has parent, but parent hasn't got child.");
-    } else {
+    } else if (m_screen) {
         m_screen->removeWindow(this);
     }
 }