Set depending objects to nullptr before deleting GUI. Fixes #806

plugins/channelrx/chanalyzer/chanalyzergui.cpp

@@ -525,6 +525,7 @@ ChannelAnalyzerGUI::ChannelAnalyzerGUI(PluginAPI* pluginAPI, DeviceUISet *device
 
 ChannelAnalyzerGUI::~ChannelAnalyzerGUI()
 {
+    m_channelAnalyzer->setSampleSink(nullptr);
     qDebug("ChannelAnalyzerGUI::~ChannelAnalyzerGUI");
 	ui->glScope->disconnectTimer();
 	delete ui;

plugins/channelrx/demodatv/atvdemodgui.cpp

@@ -275,6 +275,9 @@ ATVDemodGUI::ATVDemodGUI(PluginAPI* objPluginAPI, DeviceUISet *deviceUISet, Base
 
 ATVDemodGUI::~ATVDemodGUI()
 {
+    m_atvDemod->setScopeSink(nullptr);
+    m_atvDemod->setTVScreen(nullptr);
+
     delete m_scopeVis;
     delete ui;
 }

plugins/channelrx/demoddatv/datvdemodgui.cpp

@@ -266,6 +266,12 @@ DATVDemodGUI::DATVDemodGUI(PluginAPI* objPluginAPI, DeviceUISet *deviceUISet, Ba
 
 DATVDemodGUI::~DATVDemodGUI()
 {
+    m_objDATVDemod->SetTVScreen(nullptr);
+    m_objDATVDemod->setMERLabel(nullptr);
+    m_objDATVDemod->setCNRLabel(nullptr);
+    m_objDATVDemod->setMERMeter(nullptr);
+    m_objDATVDemod->setCNRMeter(nullptr);
+
     delete ui;
 }
 

plugins/channelrx/demoddsd/dsddemodgui.cpp

@@ -381,6 +381,7 @@ DSDDemodGUI::DSDDemodGUI(PluginAPI* pluginAPI, DeviceUISet *deviceUISet, Baseban
 
 DSDDemodGUI::~DSDDemodGUI()
 {
+    m_dsdDemod->setScopeXYSink(nullptr);
 	delete m_scopeVisXY;
 	delete ui;
 }

plugins/channelrx/demoddsd/dsddemodsink.cpp

@@ -55,7 +55,7 @@ DSDDemodSink::DSDDemodSink() :
     m_squelchDelayLine(24000),
     m_audioFifo1(48000),
     m_audioFifo2(48000),
-    m_scopeXY(0),
+    m_scopeXY(nullptr),
     m_scopeEnabled(true),
     m_dsdDecoder(),
     m_signalFormat(signalFormatNone)
@@ -297,7 +297,7 @@ void DSDDemodSink::feed(const SampleVector::const_iterator& begin, const SampleV
         }
 	}
 
-    if ((m_scopeXY != 0) && (m_scopeEnabled))
+    if ((m_scopeXY != nullptr) && (m_scopeEnabled))
     {
         m_scopeXY->feed(m_scopeSampleBuffer.begin(), m_scopeSampleBuffer.end(), true); // true = real samples for what it's worth
     }

plugins/feature/demodanalyzer/demodanalyzergui.cpp

@@ -178,6 +178,8 @@ DemodAnalyzerGUI::DemodAnalyzerGUI(PluginAPI* pluginAPI, FeatureUISet *featureUI
 
 DemodAnalyzerGUI::~DemodAnalyzerGUI()
 {
+    m_demodAnalyzer->setSampleSink(nullptr);
+
 	delete ui;
 	delete m_spectrumScopeComboVis;
 	delete m_scopeVis;