From d6a62e4fa4b3d16381d740c1215c87a419a845d9 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@freecad.org>
Date: Fri, 14 Mar 2025 16:31:27 +0100
Subject: [PATCH] Gui: Fix crash in Command::keySequenceToAccel

If FreeCAD is loaded without GUI it isn't allowed to access the
QKeySequence class as it will cause a crash. So, it checks
beforehand if QApplication::instance() is null.

This fixes issue 16407
---
 src/Gui/Command.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Gui/Command.cpp b/src/Gui/Command.cpp
index 9bf7ef88c1..0bc31de89c 100644
--- a/src/Gui/Command.cpp
+++ b/src/Gui/Command.cpp
@@ -899,8 +899,14 @@ const char* Command::keySequenceToAccel(int sk) const
     static StringMap strings;
     auto i = strings.find(sk);
 
-    if (i != strings.end())
+    if (i != strings.end()) {
         return i->second.c_str();
+    }
+
+    // In case FreeCAD is loaded without GUI (issue 16407)
+    if (!QApplication::instance()) {
+        return "";
+    }
 
     auto type = static_cast<QKeySequence::StandardKey>(sk);
     QKeySequence ks(type);