From 0ff7c3a38f7d5c1d948694886c28ef405f578f82 Mon Sep 17 00:00:00 2001
From: wandererfan <wandererfan@gmail.com>
Date: Mon, 23 Sep 2024 18:58:09 -0400
Subject: [PATCH] [TD]fix crash on bad selection (fix #16727)

---
 src/Mod/TechDraw/Gui/CommandAnnotate.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Mod/TechDraw/Gui/CommandAnnotate.cpp b/src/Mod/TechDraw/Gui/CommandAnnotate.cpp
index 62aea8fcc2..949ea63dce 100644
--- a/src/Mod/TechDraw/Gui/CommandAnnotate.cpp
+++ b/src/Mod/TechDraw/Gui/CommandAnnotate.cpp
@@ -1633,8 +1633,9 @@ void CmdTechDrawSurfaceFinishSymbols::activated(int iMsg)
     }
     else {
         auto objFeat = dynamic_cast<TechDraw::DrawView *>(selection.front().getObject());
-        if (!objFeat->isDerivedFrom(TechDraw::DrawViewPart::getClassTypeId())
-            && !objFeat->isDerivedFrom(TechDraw::DrawLeaderLine::getClassTypeId())) {
+        if ( !objFeat ||
+             !(objFeat->isDerivedFrom(TechDraw::DrawViewPart::getClassTypeId()) ||
+               objFeat->isDerivedFrom(TechDraw::DrawLeaderLine::getClassTypeId())) ) {
             QMessageBox::warning(Gui::getMainWindow(), QObject::tr("SurfaceFinishSymbols"),
                                  QObject::tr("Selected object is not a part view, nor a leader line"));
             return;