From 26b201f4bb5d87ad1b8a124416ac4070001d13eb Mon Sep 17 00:00:00 2001
From: joern274 <joern274@gmail.com>
Date: Wed, 11 Oct 2023 17:14:06 +0200
Subject: [PATCH] Bugfix: verify existence of scene pointer due to
 unpredictable order of events

---
 plugins/gui/src/graph_widget/graph_graphics_view.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/plugins/gui/src/graph_widget/graph_graphics_view.cpp b/plugins/gui/src/graph_widget/graph_graphics_view.cpp
index 8bcba14946e..f366d96afea 100644
--- a/plugins/gui/src/graph_widget/graph_graphics_view.cpp
+++ b/plugins/gui/src/graph_widget/graph_graphics_view.cpp
@@ -500,7 +500,7 @@ namespace hal
     void GraphGraphicsView::dragLeaveEvent(QDragLeaveEvent* event)
     {
         Q_UNUSED(event)
-        static_cast<GraphicsScene*>(scene())->stopDragShadow();
+        if (scene()) static_cast<GraphicsScene*>(scene())->stopDragShadow();
     }
 
     void GraphGraphicsView::dragMoveEvent(QDragMoveEvent* event)
@@ -556,7 +556,7 @@ namespace hal
         {
             event->acceptProposedAction();
             GraphicsScene* s = static_cast<GraphicsScene*>(scene());
-            s->stopDragShadow();
+            if (s) s->stopDragShadow();
             if (mDropAllowed)
             {
                 auto context            = mGraphWidget->getContext();