diff --git a/src/plugins/platforms/cocoa/qcocoanativeinterface.mm b/src/plugins/platforms/cocoa/qcocoanativeinterface.mm
index daceb1e8ad..64e2b619c1 100644
--- a/src/plugins/platforms/cocoa/qcocoanativeinterface.mm
+++ b/src/plugins/platforms/cocoa/qcocoanativeinterface.mm
@@ -231,6 +231,9 @@ void QCocoaNativeInterface::setWindowContentView(QPlatformWindow *window, void *
 
 void QCocoaNativeInterface::registerTouchWindow(QWindow *window,  bool enable)
 {
+    if (!window)
+        return;
+
     // Make sure the QCocoaWindow is created when enabling. Disabling might
     // happen on window destruction, don't (re)create the QCocoaWindow then.
     if (enable)