From f2f312ce3bebd6cae86234e0f61e40dcf397e84b Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Sat, 16 Mar 2024 01:45:37 +0100
Subject: [PATCH] TD: fixes #12984: Doing Ctrl-Z in TechDraw reliably causes a
 segfault

---
 src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp b/src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp
index f5caa68494..9575d0ca97 100644
--- a/src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp
+++ b/src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp
@@ -439,7 +439,12 @@ int ViewProviderViewPart::prefHighlightStyle()
 // TODO: does this need to be implemented for Leaderlines and ???? others?
 void ViewProviderViewPart::fixSceneDependencies()
 {
-    auto scene = getViewProviderPage()->getQGSPage();
+    auto page = getViewProviderPage();
+    if (!page) {
+        return;
+    }
+
+    auto scene = page->getQGSPage();
     auto partQView = getQView();
 
     auto dimensions =  getViewPart()->getDimensions();