diff --git a/src/blackcore/corefacade.cpp b/src/blackcore/corefacade.cpp
index 66e91134f..deb282c84 100644
--- a/src/blackcore/corefacade.cpp
+++ b/src/blackcore/corefacade.cpp
@@ -66,7 +66,7 @@ namespace BlackCore
         if (!CContextApplicationProxy::isContextResponsive(dBusAddress, connectMsg))
         {
             return CStatusMessage(this, CStatusMessage::SeverityError,
-                                  "Cannot connect DBus at '" + dBusAddress + "', reason: " + connectMsg);
+                                  u"Cannot connect DBus at '" % dBusAddress % u"', reason: " % connectMsg);
         }
 
         // re-init
diff --git a/src/blackgui/components/audiosetupcomponent.cpp b/src/blackgui/components/audiosetupcomponent.cpp
index 6645d69ea..aa6785303 100644
--- a/src/blackgui/components/audiosetupcomponent.cpp
+++ b/src/blackgui/components/audiosetupcomponent.cpp
@@ -190,13 +190,14 @@ namespace BlackGui
 
         void CAudioSetupComponent::onLoopbackToggled(bool loopback)
         {
-            Q_ASSERT(sGui->getIContextAudio());
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextAudio()) { return; }
             if (sGui->getIContextAudio()->isAudioLoopbackEnabled() == loopback) { return; }
             sGui->getIContextAudio()->enableAudioLoopback(loopback);
         }
 
         void CAudioSetupComponent::onNotificationsToggled(bool checked)
         {
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextAudio()) { return; }
             CSettings as(m_audioSettings.getThreadLocal());
             as.setNotificationFlag(CNotificationSounds::PTTClick, ui->cb_SetupAudioPTTClick->isChecked());
             as.setNotificationFlag(CNotificationSounds::NotificationVoiceRoomLeft, ui->cb_SetupAudioNotificationVoiceRoomLeft->isChecked());
diff --git a/src/blackgui/components/downloadcomponent.cpp b/src/blackgui/components/downloadcomponent.cpp
index e11f4fba2..0d0896369 100644
--- a/src/blackgui/components/downloadcomponent.cpp
+++ b/src/blackgui/components/downloadcomponent.cpp
@@ -276,7 +276,10 @@ namespace BlackGui
                     const bool shutdown = ui->cb_Shutdown->isChecked();
                     if (sGui && shutdown)
                     {
-                        QTimer::singleShot(1000, sGui, [] { CGuiApplication::exit(); });
+                        QTimer::singleShot(1000, sGui, []
+                        {
+                            CGuiApplication::exit();
+                        });
                     }
                     break;
                 }