Scene3D: fix crash in setItemAreaAndDevicePixelRatio when entity is null

Pick-to: 6.5
Change-Id: Ib4ced4fa56fb038b5ee440e0f4e752b2d2570abe
Reviewed-by: Mike Krus <mike.krus@kdab.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/src/quick3d/imports/scene3d/scene3ditem.cpp b/src/quick3d/imports/scene3d/scene3ditem.cpp
index a65fb8baa..53f238927 100644
--- a/src/quick3d/imports/scene3d/scene3ditem.cpp
+++ b/src/quick3d/imports/scene3d/scene3ditem.cpp
@@ -548,8 +548,11 @@ void Scene3DItem::createDummySurface(QWindow *rw, Qt3DRender::QRenderSurfaceSele
  */
 void Scene3DItem::setItemAreaAndDevicePixelRatio(QSize area, qreal devicePixelRatio)
 {
-    Qt3DRender::QRenderSurfaceSelector *surfaceSelector
-            = Qt3DRender::QRenderSurfaceSelectorPrivate::find(entity());
+    Qt3DCore::QEntity *rootEntity = entity();
+    if (!rootEntity) {
+        return;
+    }
+    Qt3DRender::QRenderSurfaceSelector *surfaceSelector = Qt3DRender::QRenderSurfaceSelectorPrivate::find(rootEntity);
     if (surfaceSelector) {
         surfaceSelector->setExternalRenderTargetSize(area);
         surfaceSelector->setSurfacePixelRatio(devicePixelRatio);