diff --git a/src/blackcore/context/contextsimulatorimpl.cpp b/src/blackcore/context/contextsimulatorimpl.cpp
index ea548c072..c7b1033aa 100644
--- a/src/blackcore/context/contextsimulatorimpl.cpp
+++ b/src/blackcore/context/contextsimulatorimpl.cpp
@@ -38,6 +38,7 @@
 #include <QThread>
 #include <Qt>
 #include <QtGlobal>
+#include <QPointer>
 
 using namespace BlackConfig;
 using namespace BlackMisc;
@@ -68,12 +69,18 @@ namespace BlackCore
             this->restoreSimulatorPlugins();
 
             connect(&m_weatherManager, &CWeatherManager::weatherGridReceived, this, &CContextSimulator::weatherGridReceived);
-            // seems to be redundant, as changed sim will cause changed cache
-            // connect(&m_modelSetLoader, &CAircraftModelSetLoader::simulatorChanged, this, &CDigestSignal::modelSetChanged);
             connect(&m_modelSetLoader, &CAircraftModelSetLoader::cacheChanged, this, &CContextSimulator::modelSetChanged);
 
+            // seems to be redundant, as changed simulator will cause changed cache
+            // connect(&m_modelSetLoader, &CAircraftModelSetLoader::simulatorChanged, this, &CDigestSignal::modelSetChanged);
+
             // deferred init of last model set, if no other data are set in meantime
-            QTimer::singleShot(1250, this, &CContextSimulator::initByLastUsedModelSet);
+            const QPointer<CContextSimulator> myself(this);
+            QTimer::singleShot(1250, this, [ = ]
+            {
+                if (!myself) { return; }
+                this->initByLastUsedModelSet();
+            });
         }
 
         CContextSimulator *CContextSimulator::registerWithDBus(CDBusServer *server)
diff --git a/src/blackgui/components/commandinput.cpp b/src/blackgui/components/commandinput.cpp
index 2f385d130..5c3825ed3 100644
--- a/src/blackgui/components/commandinput.cpp
+++ b/src/blackgui/components/commandinput.cpp
@@ -32,7 +32,13 @@ namespace BlackGui
                 this->setPlaceholderText(".dot commands");
             }
 
-            QTimer::singleShot(5000, &m_dsCommandTooltip, &CDigestSignal::inputSignal);
+            const QPointer<CCommandInput> myself(this);
+            QTimer::singleShot(5000, this, [ = ]
+            {
+                if (!myself) { return; }
+                m_dsCommandTooltip.inputSignal();
+            });
+
             if (sGui && sGui->supportsContexts())
             {
                 if (sGui->getIContextSimulator())
diff --git a/src/blackgui/overlaymessages.cpp b/src/blackgui/overlaymessages.cpp
index ddc8cb25d..1f9e45ba8 100644
--- a/src/blackgui/overlaymessages.cpp
+++ b/src/blackgui/overlaymessages.cpp
@@ -35,6 +35,7 @@
 #include <QToolButton>
 #include <Qt>
 #include <QtGlobal>
+#include <QPointer>
 
 using namespace BlackMisc;
 using namespace BlackMisc::Network;
@@ -453,7 +454,13 @@ namespace BlackGui
         {
             std::function<void()> f = m_pendingMessageCalls.front();
             m_pendingMessageCalls.removeFirst();
-            QTimer::singleShot(500, this, f);
+            const QPointer<COverlayMessages> myself(this);
+            QTimer::singleShot(500, this, [ = ]
+            {
+                if (!myself) { return; }
+                if (!sGui || sGui->isShuttingDown()) { return; }
+                f();
+            });
         }
     }
 
diff --git a/src/blackmisc/digestsignal.cpp b/src/blackmisc/digestsignal.cpp
index 9fd55ffe8..c8dc6123f 100644
--- a/src/blackmisc/digestsignal.cpp
+++ b/src/blackmisc/digestsignal.cpp
@@ -9,6 +9,7 @@
 
 #include "digestsignal.h"
 #include "threadutils.h"
+#include <QPointer>
 
 namespace BlackMisc
 {
@@ -17,7 +18,12 @@ namespace BlackMisc
         if (!CThreadUtils::isCurrentThreadObjectThread(this))
         {
             // call in correct thread
-            QTimer::singleShot(0, this, &CDigestSignal::inputSignal);
+            const QPointer<CDigestSignal> myself(this);
+            QTimer::singleShot(0, this, [ = ]
+            {
+                if (!myself) { return; }
+                this->inputSignal();
+            });
             return;
         }
 
@@ -33,7 +39,7 @@ namespace BlackMisc
     {
         m_timer.stop();
         m_inputsCount = 0;
-        emit digestSignal();
+        emit this->digestSignal();
     }
 
     void CDigestSignal::init(int maxDelayMs)
@@ -42,5 +48,4 @@ namespace BlackMisc
         m_timer.setSingleShot(true);
         m_timer.setInterval(maxDelayMs);
     }
-
 } // namespace