diff --git a/ApplicationLibCode/Application/RiaGuiApplication.cpp b/ApplicationLibCode/Application/RiaGuiApplication.cpp
index 235f79856b..c45b80339c 100644
--- a/ApplicationLibCode/Application/RiaGuiApplication.cpp
+++ b/ApplicationLibCode/Application/RiaGuiApplication.cpp
@@ -1332,7 +1332,10 @@ void RiaGuiApplication::onProjectBeingSaved()
     setLastUsedDialogDirectory( "BINARY_GRID", QFileInfo( m_project->fileName() ).absolutePath() );
     storeTreeViewState();
 
-    RiaSummaryTools::summaryCaseMainCollection()->onProjectBeingSaved();
+    if ( auto sumCaseMainColl = RiaSummaryTools::summaryCaseMainCollection() )
+    {
+        sumCaseMainColl->onProjectBeingSaved();
+    }
 }
 
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationLibCode/Application/Tools/Summary/RiaSummaryTools.cpp b/ApplicationLibCode/Application/Tools/Summary/RiaSummaryTools.cpp
index 0bec319dff..060dbaed65 100644
--- a/ApplicationLibCode/Application/Tools/Summary/RiaSummaryTools.cpp
+++ b/ApplicationLibCode/Application/Tools/Summary/RiaSummaryTools.cpp
@@ -73,10 +73,8 @@ std::vector<RimSummaryCase*> RiaSummaryTools::singleTopLevelSummaryCases()
 //--------------------------------------------------------------------------------------------------
 RimSummaryCaseMainCollection* RiaSummaryTools::summaryCaseMainCollection()
 {
-    RimProject*                   project                   = RimProject::current();
-    RimSummaryCaseMainCollection* summaryCaseMainCollection = project->activeOilField()->summaryCaseMainCollection();
-    CVF_ASSERT( summaryCaseMainCollection );
-    return summaryCaseMainCollection;
+    RimProject* project = RimProject::current();
+    return project->activeOilField()->summaryCaseMainCollection();
 }
 
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationLibCode/Commands/SummaryPlotCommands/RicNewDerivedEnsembleFeature.cpp b/ApplicationLibCode/Commands/SummaryPlotCommands/RicNewDerivedEnsembleFeature.cpp
index bc79ef48e7..a54e2f48f1 100644
--- a/ApplicationLibCode/Commands/SummaryPlotCommands/RicNewDerivedEnsembleFeature.cpp
+++ b/ApplicationLibCode/Commands/SummaryPlotCommands/RicNewDerivedEnsembleFeature.cpp
@@ -18,6 +18,8 @@
 
 #include "RicNewDerivedEnsembleFeature.h"
 
+#include "Summary/RiaSummaryTools.h"
+
 #include "RimDeltaSummaryEnsemble.h"
 #include "RimProject.h"
 #include "RimSummaryCaseMainCollection.h"
@@ -73,34 +75,32 @@ bool RicNewDerivedEnsembleFeature::isCommandEnabled() const
 //--------------------------------------------------------------------------------------------------
 void RicNewDerivedEnsembleFeature::onActionTriggered( bool isChecked )
 {
+    auto sumCaseMainColl = RiaSummaryTools::summaryCaseMainCollection();
+    if ( !sumCaseMainColl ) return;
+
     if ( isCommandEnabled() )
     {
-        auto project  = RimProject::current();
-        auto mainColl = project->firstSummaryCaseMainCollection();
-
-        auto newColl     = mainColl->addEnsemble( {}, "", true, []() { return new RimDeltaSummaryEnsemble(); } );
+        auto newColl     = sumCaseMainColl->addEnsemble( {}, "", true, []() { return new RimDeltaSummaryEnsemble(); } );
         auto newEnsemble = dynamic_cast<RimDeltaSummaryEnsemble*>( newColl );
 
+        std::vector<RimSummaryEnsemble*> ensembles = caf::selectedObjectsByType<RimSummaryEnsemble*>();
+
+        if ( !ensembles.empty() ) newEnsemble->setEnsemble1( ensembles[0] );
+        if ( ensembles.size() == 2 )
         {
-            std::vector<RimSummaryEnsemble*> ensembles = caf::selectedObjectsByType<RimSummaryEnsemble*>();
+            newEnsemble->setEnsemble2( ensembles[1] );
+            newEnsemble->createDerivedEnsembleCases();
 
-            if ( !ensembles.empty() ) newEnsemble->setEnsemble1( ensembles[0] );
-            if ( ensembles.size() == 2 )
+            if ( newEnsemble->allSummaryCases().empty() )
             {
-                newEnsemble->setEnsemble2( ensembles[1] );
-                newEnsemble->createDerivedEnsembleCases();
-
-                if ( newEnsemble->allSummaryCases().empty() )
+                if ( !showWarningDialogWithQuestion() )
                 {
-                    if ( !showWarningDialogWithQuestion() )
-                    {
-                        mainColl->removeEnsemble( newEnsemble );
-                    }
+                    sumCaseMainColl->removeEnsemble( newEnsemble );
                 }
             }
         }
 
-        mainColl->updateConnectedEditors();
+        sumCaseMainColl->updateConnectedEditors();
         RiuPlotMainWindowTools::selectAsCurrentItem( newEnsemble );
     }
 }
diff --git a/ApplicationLibCode/Commands/SummaryPlotCommands/RicOpenSummaryPlotEditorFeature.cpp b/ApplicationLibCode/Commands/SummaryPlotCommands/RicOpenSummaryPlotEditorFeature.cpp
index 1dd7205164..1a0bda0f1a 100644
--- a/ApplicationLibCode/Commands/SummaryPlotCommands/RicOpenSummaryPlotEditorFeature.cpp
+++ b/ApplicationLibCode/Commands/SummaryPlotCommands/RicOpenSummaryPlotEditorFeature.cpp
@@ -93,7 +93,6 @@ bool RicOpenSummaryPlotEditorFeature::isCommandEnabled() const
 void RicOpenSummaryPlotEditorFeature::onActionTriggered( bool isChecked )
 {
     RimProject* project = RimProject::current();
-    CVF_ASSERT( project );
 
     std::vector<RimSummaryCase*>     selectedCases  = caf::selectedObjectsByType<RimSummaryCase*>();
     std::vector<RimSummaryEnsemble*> selectedGroups = caf::selectedObjectsByType<RimSummaryEnsemble*>();
@@ -102,16 +101,20 @@ void RicOpenSummaryPlotEditorFeature::onActionTriggered( bool isChecked )
 
     if ( sourcesToSelect.empty() && selectedGroups.empty() )
     {
-        const auto                       allSingleCases = project->firstSummaryCaseMainCollection()->topLevelSummaryCases();
-        const auto                       ensembles      = project->summaryEnsembles();
+        const auto                       ensembles = project->summaryEnsembles();
         std::vector<RimSummaryEnsemble*> allEnsembles;
         for ( const auto ensemble : ensembles )
             if ( ensemble->isEnsemble() ) allEnsembles.push_back( ensemble );
 
-        if ( !allSingleCases.empty() )
+        if ( auto sumCaseMainColl = RiaSummaryTools::summaryCaseMainCollection() )
         {
-            sourcesToSelect.push_back( allSingleCases.front() );
+            const auto allSingleCases = sumCaseMainColl->topLevelSummaryCases();
+            if ( !allSingleCases.empty() )
+            {
+                sourcesToSelect.push_back( allSingleCases.front() );
+            }
         }
+
         else if ( !allEnsembles.empty() )
         {
             sourcesToSelect.push_back( allEnsembles.front() );
diff --git a/ApplicationLibCode/ProjectDataModel/Cloud/RimCloudDataSourceCollection.cpp b/ApplicationLibCode/ProjectDataModel/Cloud/RimCloudDataSourceCollection.cpp
index c5a99e6f81..387dcb9a1c 100644
--- a/ApplicationLibCode/ProjectDataModel/Cloud/RimCloudDataSourceCollection.cpp
+++ b/ApplicationLibCode/ProjectDataModel/Cloud/RimCloudDataSourceCollection.cpp
@@ -83,19 +83,22 @@ std::vector<RimSummarySumoDataSource*> RimCloudDataSourceCollection::sumoDataSou
 //--------------------------------------------------------------------------------------------------
 void RimCloudDataSourceCollection::createEnsemblesFromSelectedDataSources( const std::vector<RimSummarySumoDataSource*>& dataSources )
 {
+    auto sumCaseMainColl = RiaSummaryTools::summaryCaseMainCollection();
+    if ( !sumCaseMainColl ) return;
+
     for ( auto dataSource : dataSources )
     {
         RimSummaryEnsembleSumo* ensemble = new RimSummaryEnsembleSumo();
         ensemble->setUsePathKey1( true );
         ensemble->setSumoDataSource( dataSource );
-        RiaSummaryTools::summaryCaseMainCollection()->addEnsemble( ensemble );
+        sumCaseMainColl->addEnsemble( ensemble );
         ensemble->loadDataAndUpdate();
 
         RiaSummaryPlotTools::createAndAppendDefaultSummaryMultiPlot( {}, { ensemble } );
     }
 
     RiaSummaryTools::updateSummaryEnsembleNames();
-    RiaSummaryTools::summaryCaseMainCollection()->updateAllRequiredEditors();
+    sumCaseMainColl->updateAllRequiredEditors();
 }
 
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationLibCode/ProjectDataModel/EnsembleFileSet/RimEnsembleFileSetTools.cpp b/ApplicationLibCode/ProjectDataModel/EnsembleFileSet/RimEnsembleFileSetTools.cpp
index 504c87e006..184b0547a8 100644
--- a/ApplicationLibCode/ProjectDataModel/EnsembleFileSet/RimEnsembleFileSetTools.cpp
+++ b/ApplicationLibCode/ProjectDataModel/EnsembleFileSet/RimEnsembleFileSetTools.cpp
@@ -36,18 +36,21 @@ namespace RimEnsembleFileSetTools
 //--------------------------------------------------------------------------------------------------
 std::vector<RimSummaryEnsemble*> createSummaryEnsemblesFromFileSets( const std::vector<RimEnsembleFileSet*> fileSets )
 {
+    auto sumCaseMainColl = RiaSummaryTools::summaryCaseMainCollection();
+    if ( !sumCaseMainColl ) return {};
+
     std::vector<RimSummaryEnsemble*> ensembles;
     for ( auto fileSet : fileSets )
     {
         auto ensemble = new RimSummaryFileSetEnsemble();
         ensemble->setEnsembleFileSet( fileSet );
-        RiaSummaryTools::summaryCaseMainCollection()->addEnsemble( ensemble );
-        RiaSummaryTools::summaryCaseMainCollection()->updateEnsembleNames();
+        sumCaseMainColl->addEnsemble( ensemble );
+        sumCaseMainColl->updateEnsembleNames();
         ensemble->loadDataAndUpdate();
         ensembles.push_back( ensemble );
     }
 
-    RiaSummaryTools::summaryCaseMainCollection()->updateAllRequiredEditors();
+    sumCaseMainColl->updateAllRequiredEditors();
 
     return ensembles;
 }
diff --git a/ApplicationLibCode/ProjectDataModel/RimProject.cpp b/ApplicationLibCode/ProjectDataModel/RimProject.cpp
index 1bef518123..043bcfe601 100644
--- a/ApplicationLibCode/ProjectDataModel/RimProject.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimProject.cpp
@@ -810,15 +810,6 @@ std::vector<RimSummaryEnsemble*> RimProject::summaryEnsembles() const
     return ensembles;
 }
 
-//--------------------------------------------------------------------------------------------------
-///
-//--------------------------------------------------------------------------------------------------
-RimSummaryCaseMainCollection* RimProject::firstSummaryCaseMainCollection() const
-{
-    if ( oilFields.empty() ) return nullptr;
-    return oilFields[0]->summaryCaseMainCollection;
-}
-
 //--------------------------------------------------------------------------------------------------
 ///
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationLibCode/ProjectDataModel/RimProject.h b/ApplicationLibCode/ProjectDataModel/RimProject.h
index 3b3cd3b96f..176fcb4517 100644
--- a/ApplicationLibCode/ProjectDataModel/RimProject.h
+++ b/ApplicationLibCode/ProjectDataModel/RimProject.h
@@ -134,7 +134,6 @@ public:
 
     std::vector<RimSummaryCase*>     allSummaryCases() const;
     std::vector<RimSummaryEnsemble*> summaryEnsembles() const;
-    RimSummaryCaseMainCollection*    firstSummaryCaseMainCollection() const;
 
     [[nodiscard]] std::vector<Rim3dView*>   allViews() const;
     [[nodiscard]] std::vector<Rim3dView*>   allVisibleViews() const;
diff --git a/ApplicationLibCode/ProjectDataModel/RimReloadCaseTools.cpp b/ApplicationLibCode/ProjectDataModel/RimReloadCaseTools.cpp
index 6f0cf6187c..26b151939d 100644
--- a/ApplicationLibCode/ProjectDataModel/RimReloadCaseTools.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimReloadCaseTools.cpp
@@ -187,9 +187,10 @@ RimEclipseCase* RimReloadCaseTools::gridModelFromSummaryCase( const RimSummaryCa
 //--------------------------------------------------------------------------------------------------
 RimSummaryCase* RimReloadCaseTools::findSummaryCaseFromEclipseResultCase( const RimEclipseResultCase* eclipseResultCase )
 {
-    RiaEclipseFileNameTools helper( eclipseResultCase->gridFileName() );
-
     RimSummaryCaseMainCollection* sumCaseColl = RiaSummaryTools::summaryCaseMainCollection();
+    if ( !sumCaseColl ) return nullptr;
+
+    RiaEclipseFileNameTools helper( eclipseResultCase->gridFileName() );
 
     auto summaryFileNames = helper.findSummaryFileCandidates();
     for ( const auto& fileName : summaryFileNames )
diff --git a/ApplicationLibCode/ProjectDataModel/RimSummaryCalculationCollection.cpp b/ApplicationLibCode/ProjectDataModel/RimSummaryCalculationCollection.cpp
index 7da7964af6..62e1f92a81 100644
--- a/ApplicationLibCode/ProjectDataModel/RimSummaryCalculationCollection.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimSummaryCalculationCollection.cpp
@@ -54,19 +54,21 @@ void RimSummaryCalculationCollection::updateDataDependingOnCalculations()
 
     // Refresh data sources tree
     // Refresh meta data for all summary cases and rebuild AddressNodes in the summary tree
-    RimSummaryCaseMainCollection* summaryCaseCollection = RiaSummaryTools::summaryCaseMainCollection();
-    auto                          summaryCases          = summaryCaseCollection->allSummaryCases();
-    for ( RimSummaryCase* summaryCase : summaryCases )
+    if ( auto summaryCaseCollection = RiaSummaryTools::summaryCaseMainCollection() )
     {
-        if ( !summaryCase ) continue;
-
-        if ( summaryCase->showVectorItemsInProjectTree() )
+        auto summaryCases = summaryCaseCollection->allSummaryCases();
+        for ( RimSummaryCase* summaryCase : summaryCases )
         {
-            if ( auto reader = summaryCase->summaryReader() )
+            if ( !summaryCase ) continue;
+
+            if ( summaryCase->showVectorItemsInProjectTree() )
             {
-                reader->createAndSetAddresses();
+                if ( auto reader = summaryCase->summaryReader() )
+                {
+                    reader->createAndSetAddresses();
+                }
+                summaryCase->onCalculationUpdated();
             }
-            summaryCase->onCalculationUpdated();
         }
     }
 
@@ -83,9 +85,12 @@ void RimSummaryCalculationCollection::updateDataDependingOnCalculations()
         }
     }
 
-    for ( auto ensemble : summaryCaseCollection->summaryEnsembles() )
+    if ( auto summaryCaseCollection = RiaSummaryTools::summaryCaseMainCollection() )
     {
-        ensemble->onCalculationUpdated();
+        for ( auto ensemble : summaryCaseCollection->summaryEnsembles() )
+        {
+            ensemble->onCalculationUpdated();
+        }
     }
 }
 
diff --git a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryTable.cpp b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryTable.cpp
index a0420e9492..952efafbdb 100644
--- a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryTable.cpp
+++ b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryTable.cpp
@@ -696,6 +696,7 @@ std::vector<RimSummaryCase*> RimSummaryTable::getToplevelSummaryCases() const
 {
     RimSummaryCaseMainCollection* summaryCaseMainCollection = RiaSummaryTools::summaryCaseMainCollection();
     if ( !summaryCaseMainCollection ) return {};
+
     return summaryCaseMainCollection->topLevelSummaryCases();
 }
 
diff --git a/ApplicationLibCode/UserInterface/RiuPlotMainWindow.cpp b/ApplicationLibCode/UserInterface/RiuPlotMainWindow.cpp
index d8e623a557..4b059c6f24 100644
--- a/ApplicationLibCode/UserInterface/RiuPlotMainWindow.cpp
+++ b/ApplicationLibCode/UserInterface/RiuPlotMainWindow.cpp
@@ -181,19 +181,18 @@ void RiuPlotMainWindow::initializeGuiNewProjectLoaded()
     auto sumPlotManager = dynamic_cast<RimSummaryPlotManager*>( m_summaryPlotManager.get() );
     if ( sumPlotManager )
     {
-        auto* obj = RiaSummaryTools::summaryCaseMainCollection();
-        obj->dataSourceHasChanged.connect( sumPlotManager, &RimSummaryPlotManager::onSummaryDataSourceHasChanged );
+        if ( auto* sumCaseMainColl = RiaSummaryTools::summaryCaseMainCollection() )
+        {
+            sumCaseMainColl->dataSourceHasChanged.connect( sumPlotManager, &RimSummaryPlotManager::onSummaryDataSourceHasChanged );
+        }
 
         sumPlotManager->resetDataSourceSelection();
         sumPlotManager->updateConnectedEditors();
     }
 
+    if ( auto* sumCaseMainColl = RiaSummaryTools::summaryCaseMainCollection() )
     {
-        auto* obj = RiaSummaryTools::summaryCaseMainCollection();
-        if ( obj )
-        {
-            setExpanded( obj );
-        }
+        setExpanded( sumCaseMainColl );
     }
 
     {