Null pointer check for example

The documentation says that defaultOutput() is initialized later.

Change-Id: I3dcc6c9dc7395c7986721235333388614928347c
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/examples/wayland/qwindow-compositor/windowcompositor.cpp b/examples/wayland/qwindow-compositor/windowcompositor.cpp
index b55975623..24a0e0f52 100644
--- a/examples/wayland/qwindow-compositor/windowcompositor.cpp
+++ b/examples/wayland/qwindow-compositor/windowcompositor.cpp
@@ -198,12 +198,16 @@ void WindowCompositor::triggerRender()
 
 void WindowCompositor::startRender()
 {
-    defaultOutput()->frameStarted();
+    QWaylandOutput *out = defaultOutput();
+    if (out)
+        out->frameStarted();
 }
 
 void WindowCompositor::endRender()
 {
-    defaultOutput()->sendFrameCallbacks();
+    QWaylandOutput *out = defaultOutput();
+    if (out)
+        out->sendFrameCallbacks();
 }
 
 void WindowCompositor::updateCursor()