From 91c23a57f39103201d305480eb24039942a376ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Julius=20K=C3=BCnzel?= <julius.kuenzel@kde.org>
Date: Sat, 2 Nov 2024 17:17:09 +0100
Subject: [PATCH] Don't try to access QDBusMessage if not successful reply

In case it is a ErrorMessage the arguments QList is empty and calling
reply.first() will cause a crash
---
 src/colors/kcolorschemewatcher_xdg.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/colors/kcolorschemewatcher_xdg.cpp b/src/colors/kcolorschemewatcher_xdg.cpp
index 60693ad..535a54e 100644
--- a/src/colors/kcolorschemewatcher_xdg.cpp
+++ b/src/colors/kcolorschemewatcher_xdg.cpp
@@ -8,6 +8,7 @@
 
 #include <QDBusConnection>
 #include <QDBusMessage>
+#include <QDBusReply>
 #include <QDBusVariant>
 #include <QDebug>
 
@@ -27,10 +28,12 @@ KColorSchemeWatcherXDG::KColorSchemeWatcherXDG()
                                                     QStringLiteral("Read"));
     m.setArguments({QStringLiteral("org.freedesktop.appearance"), QStringLiteral("color-scheme")});
 
-    auto reply = QDBusConnection::sessionBus().call(m);
+    QDBusReply<QDBusVariant> reply = QDBusConnection::sessionBus().call(m);
 
-    const uint result = reply.arguments().first().value<QDBusVariant>().variant().value<QDBusVariant>().variant().toUInt();
-    m_preference = fdoToInternal(result);
+    if (reply.isValid()) {
+        const uint result = reply.value().variant().toUInt();
+        m_preference = fdoToInternal(result);
+    }
 }
 
 KColorSchemeWatcher::ColorPreference KColorSchemeWatcherXDG::systemPreference() const
-- 
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