diff --git a/ApplicationLibCode/ProjectDataModel/CorrelationPlots/RimParameterResultCrossPlot.cpp b/ApplicationLibCode/ProjectDataModel/CorrelationPlots/RimParameterResultCrossPlot.cpp
index 087f3e0c6e..4e2715896f 100644
--- a/ApplicationLibCode/ProjectDataModel/CorrelationPlots/RimParameterResultCrossPlot.cpp
+++ b/ApplicationLibCode/ProjectDataModel/CorrelationPlots/RimParameterResultCrossPlot.cpp
@@ -569,6 +569,7 @@ protected:
         double  minDistance = std::numeric_limits<double>::max();
         QString closestCurveLabel;
 
+        // Ok to access reference to list, no add/remove of item during iteration
         for ( QwtPlotItem* item : plot()->itemList() )
         {
             if ( item->rtti() == QwtPlotItem::Rtti_PlotCurve )
diff --git a/ApplicationLibCode/UserInterface/AnalysisPlots/RiuGroupedBarChartBuilder.cpp b/ApplicationLibCode/UserInterface/AnalysisPlots/RiuGroupedBarChartBuilder.cpp
index 8778225ca8..88b33b2a15 100644
--- a/ApplicationLibCode/UserInterface/AnalysisPlots/RiuGroupedBarChartBuilder.cpp
+++ b/ApplicationLibCode/UserInterface/AnalysisPlots/RiuGroupedBarChartBuilder.cpp
@@ -710,6 +710,7 @@ void RiuGroupedBarChartBuilder::addBarChartToPlot( QwtPlot* plot, Qt::Orientatio
 
         // Get or create the two grids used in the plot
         {
+            // Ok to access reference to list, no add/remove of item during iteration
             QwtPlotItemList gridList = plot->itemList( QwtPlotItem::Rtti_PlotGrid );
             for ( QwtPlotItem* plItem : gridList )
             {
diff --git a/ApplicationLibCode/UserInterface/RiuPvtPlotWidget.cpp b/ApplicationLibCode/UserInterface/RiuPvtPlotWidget.cpp
index 5a6a6e3bf2..c62c1df296 100644
--- a/ApplicationLibCode/UserInterface/RiuPvtPlotWidget.cpp
+++ b/ApplicationLibCode/UserInterface/RiuPvtPlotWidget.cpp
@@ -424,6 +424,7 @@ const QwtPlotCurve* RiuPvtPlotWidget::closestCurveSample( const QPoint& cursorPo
     double              distMin                 = HUGE_VAL;
     int                 closestPointSampleIndex = -1;
 
+    // Ok to access reference to list, no add/remove of item during iteration
     const QwtPlotItemList& itemList = m_qwtPlot->itemList();
     for ( QwtPlotItemIterator it = itemList.begin(); it != itemList.end(); it++ )
     {
diff --git a/ApplicationLibCode/UserInterface/RiuQwtCurvePointTracker.cpp b/ApplicationLibCode/UserInterface/RiuQwtCurvePointTracker.cpp
index ceed8c7331..0da1501466 100644
--- a/ApplicationLibCode/UserInterface/RiuQwtCurvePointTracker.cpp
+++ b/ApplicationLibCode/UserInterface/RiuQwtCurvePointTracker.cpp
@@ -146,6 +146,7 @@ QPointF RiuQwtCurvePointTracker::closestCurvePoint( const QPoint& cursorPosition
     double        distMin                 = DBL_MAX;
     int           closestPointSampleIndex = -1;
 
+    // Ok to access reference to list, no add/remove of item during iteration
     const QwtPlotItemList& itmList = m_plot->itemList();
     for ( QwtPlotItemIterator it = itmList.begin(); it != itmList.end(); it++ )
     {
diff --git a/ApplicationLibCode/UserInterface/RiuQwtPlotTools.cpp b/ApplicationLibCode/UserInterface/RiuQwtPlotTools.cpp
index 546d3a32c2..929403268b 100644
--- a/ApplicationLibCode/UserInterface/RiuQwtPlotTools.cpp
+++ b/ApplicationLibCode/UserInterface/RiuQwtPlotTools.cpp
@@ -325,6 +325,7 @@ QList<QwtLegendData> RiuQwtPlotTools::createLegendData( const std::vector<RimPlo
 //--------------------------------------------------------------------------------------------------
 void RiuQwtPlotTools::enableGridLines( QwtPlot* plot, QwtAxis::Position axis, bool enableMajor, bool enableMinor )
 {
+    // NB: Make a copy, not reference to avoid iterator invalidation
     QwtPlotItemList plotItems = plot->itemList( QwtPlotItem::Rtti_PlotGrid );
     for ( QwtPlotItem* plotItem : plotItems )
     {
diff --git a/ApplicationLibCode/UserInterface/RiuQwtPlotWidget.cpp b/ApplicationLibCode/UserInterface/RiuQwtPlotWidget.cpp
index 6121238ecd..cf84cf5634 100644
--- a/ApplicationLibCode/UserInterface/RiuQwtPlotWidget.cpp
+++ b/ApplicationLibCode/UserInterface/RiuQwtPlotWidget.cpp
@@ -349,6 +349,7 @@ void RiuQwtPlotWidget::setAxisLabelsAndTicksEnabled( RiuPlotAxis axis, bool enab
 //--------------------------------------------------------------------------------------------------
 void RiuQwtPlotWidget::enableGridLines( RiuPlotAxis axis, bool majorGridLines, bool minorGridLines )
 {
+    // NB: Make a copy, not reference to avoid iterator invalidation
     QwtPlotItemList plotItems = m_plot->itemList( QwtPlotItem::Rtti_PlotGrid );
     auto            qwtAxis   = toQwtPlotAxis( axis );
     for ( QwtPlotItem* plotItem : plotItems )
@@ -893,6 +894,7 @@ void RiuQwtPlotWidget::findClosestPlotItem( const QPoint& pos, QwtPlotItem** clo
     *closestCurveSampleIndex = -1;
     *distanceFromClick       = std::numeric_limits<double>::infinity();
 
+    // Ok to access reference to list, no add/remove of item during iteration
     const QwtPlotItemList& itmList = m_plot->itemList();
     for ( auto it : itmList )
     {
@@ -1109,6 +1111,7 @@ void RiuQwtPlotWidget::highlightPlotCurves( const std::vector<RimPlotCurve*>& cu
         return;
     }
 
+    // NB: Make a copy, not reference to avoid iterator invalidation
     auto plotItemList = m_plot->itemList();
     for ( QwtPlotItem* plotItem : plotItemList )
     {
@@ -1190,6 +1193,7 @@ void RiuQwtPlotWidget::highlightPlotCurves( const std::vector<RimPlotCurve*>& cu
 //--------------------------------------------------------------------------------------------------
 void RiuQwtPlotWidget::highlightPlotShapeItems( const std::set<const QwtPlotItem*>& closestItems )
 {
+    // NB: Make a copy, not reference to avoid iterator invalidation
     auto plotItemList = m_plot->itemList();
     for ( QwtPlotItem* plotItem : plotItemList )
     {
@@ -1238,7 +1242,8 @@ void RiuQwtPlotWidget::resetPlotCurveHighlighting()
         return;
     }
 
-    const auto& plotItemList = m_plot->itemList();
+    // NB: Make a copy, not reference to avoid iterator invalidation
+    const QwtPlotItemList plotItemList = m_plot->itemList();
     for ( QwtPlotItem* plotItem : plotItemList )
     {
         if ( auto* riuPlotCurve = dynamic_cast<RiuQwtPlotCurve*>( plotItem ) )
@@ -1260,7 +1265,8 @@ void RiuQwtPlotWidget::resetPlotCurveHighlighting()
 //--------------------------------------------------------------------------------------------------
 void RiuQwtPlotWidget::resetPlotShapeItemHighlighting()
 {
-    const auto& plotItemList = m_plot->itemList();
+    // NB: Make a copy, not reference to avoid iterator invalidation
+    const QwtPlotItemList plotItemList = m_plot->itemList();
     for ( QwtPlotItem* plotItem : plotItemList )
     {
         auto* plotShapeItem = dynamic_cast<QwtPlotShapeItem*>( plotItem );
@@ -1312,6 +1318,7 @@ void RiuQwtPlotWidget::highlightPlotItemsForQwtAxis( QwtAxisId axisId )
 {
     std::vector<RimPlotCurve*> curves;
 
+    // NB: Make a copy, not reference to avoid iterator invalidation
     auto plotItemList = m_plot->itemList();
     for ( QwtPlotItem* plotItem : plotItemList )
     {