diff --git a/src/SeerParallelStacksCommon.cpp b/src/SeerParallelStacksCommon.cpp
index f19a7c3..4927dea 100644
--- a/src/SeerParallelStacksCommon.cpp
+++ b/src/SeerParallelStacksCommon.cpp
@@ -144,22 +144,27 @@ QString SeerParallelStacksThread::toString() const {
     return result;
 }
 
-static std::shared_ptr<SeerParallelStacksStackNode> buildImpl( QVector<SeerParallelStacksThread*>& threadPtrs, const QString& currentFunction, int depth) {
+static std::shared_ptr<SeerParallelStacksStackNode> buildImpl(const QVector<SeerParallelStacksThread>& threads, const QString& currentFunction, int depth) {
 
     auto node      = std::make_shared<SeerParallelStacksStackNode>();
     node->depth    = depth;
     node->function = currentFunction;
-    node->threads  = threadPtrs;
+    node->threads  = threads;
 
     // Group threads by the function at position [-depth-1] (bottom-up).
-    QMap<QString, QVector<SeerParallelStacksThread*>> functionThreads;
+    QMap<QString, QVector<SeerParallelStacksThread>> functionThreads;
+
     int level = -depth - 1;
 
-    for (SeerParallelStacksThread* t : threadPtrs) {
-        int idx = t->frames().size() + level; // convert negative index
-        if (idx < 0 || idx >= t->frames().size())
+    for (const SeerParallelStacksThread& t : threads) {
+        int idx = t.frames().size() + level; // convert negative index
+
+        if (idx < 0 || idx >= t.frames().size()) {
             continue;
-        const QString& fn = t->frames()[idx].function();
+        }
+
+        const QString& fn = t.frames()[idx].function();
+
         functionThreads[fn].append(t);
     }
 
@@ -171,16 +176,9 @@ static std::shared_ptr<SeerParallelStacksStackNode> buildImpl( QVector<SeerParal
     return node;
 }
 
-std::shared_ptr<SeerParallelStacksStackNode> SeerParallelStacksBuildParallelStacks(QVector<SeerParallelStacksThread>& threads) {
+std::shared_ptr<SeerParallelStacksStackNode> SeerParallelStacksBuildParallelStacks(const QVector<SeerParallelStacksThread>& threads) {
 
-    QVector<SeerParallelStacksThread*> ptrs;
-    ptrs.reserve(threads.size());
-
-    for (auto& t : threads) {
-        ptrs.append(&t);
-    }
-
-    return buildImpl(ptrs, QString(), 0);
+    return buildImpl(threads, QString(), 0);
 }
 
 // ---------------------------------------------------------------
@@ -192,8 +190,8 @@ std::shared_ptr<SeerParallelStacksStack> SeerParallelStacksFillStack(const std::
     stack->threadCount = static_cast<int>(node->threads.size());
 
     // Collect thread IDs for this node
-    for (const SeerParallelStacksThread* t : node->threads) {
-        stack->threadIds.append(t->id());
+    for (const SeerParallelStacksThread& t : node->threads) {
+        stack->threadIds.append(t.id());
     }
 
     if (!node->function.isEmpty()) {
diff --git a/src/SeerParallelStacksCommon.h b/src/SeerParallelStacksCommon.h
index 3502740..d3f1486 100644
--- a/src/SeerParallelStacksCommon.h
+++ b/src/SeerParallelStacksCommon.h
@@ -75,7 +75,7 @@ typedef QVector<SeerParallelStacksThread> SeerParallelStacksThreads;
 struct SeerParallelStacksStackNode {
     QString                                                   function;    // empty == root
     int                                                       depth  = 0;
-    QVector<SeerParallelStacksThread*>                        threads;     // non-owning pointers
+    QVector<SeerParallelStacksThread>                         threads;
     QVector<std::shared_ptr<SeerParallelStacksStackNode>>     children;
 };
 
@@ -88,6 +88,6 @@ struct SeerParallelStacksStack {
     int                                                       threadCount = 0;
 };
 
-std::shared_ptr<SeerParallelStacksStackNode>      SeerParallelStacksBuildParallelStacks     (QVector<SeerParallelStacksThread>& threads);   // Build the parallel-stacks tree from a flat list of threads.
+std::shared_ptr<SeerParallelStacksStackNode>      SeerParallelStacksBuildParallelStacks     (const QVector<SeerParallelStacksThread>& threads);   // Build the parallel-stacks tree from a flat list of threads.
 std::shared_ptr<SeerParallelStacksStack>          SeerParallelStacksFillStack               (const std::shared_ptr<SeerParallelStacksStackNode>& node);
 
diff --git a/src/SeerParallelStacksGraphicsView.cpp b/src/SeerParallelStacksGraphicsView.cpp
index 7f6a8e9..970a8fb 100644
--- a/src/SeerParallelStacksGraphicsView.cpp
+++ b/src/SeerParallelStacksGraphicsView.cpp
@@ -561,7 +561,7 @@ SeerParallelStacksPopupTableWidget::SeerParallelStacksPopupTableWidget(QWidget*
     _table->viewport()->setMouseTracking(true);
     _table->horizontalHeader()->setStretchLastSection(true);
     _table->verticalHeader()->setVisible(false);
-    _table->setEditTriggers(QAbstractItemView::DoubleClicked); // NoEditTriggers
+    _table->setEditTriggers(QAbstractItemView::NoEditTriggers);
     _table->setSelectionBehavior(QAbstractItemView::SelectRows);
     _table->setFrameShape(QFrame::NoFrame); // outer QFrame provides the border
     _table->resizeColumnToContents(0);
diff --git a/src/SeerParallelStacksVisualizerWidget.cpp b/src/SeerParallelStacksVisualizerWidget.cpp
index 0ba9c04..f1ecdf0 100644
--- a/src/SeerParallelStacksVisualizerWidget.cpp
+++ b/src/SeerParallelStacksVisualizerWidget.cpp
@@ -260,9 +260,7 @@ void SeerParallelStacksVisualizerWidget::createDirectedGraph() {
     }
 
     // Build parallel-stacks tree
-    QVector<SeerParallelStacksThread> local = _threads; // mutable copy for ptr stability
-
-    auto root  = SeerParallelStacksBuildParallelStacks(local);
+    auto root  = SeerParallelStacksBuildParallelStacks(_threads);
     auto stack = SeerParallelStacksFillStack(root);
 
     graphicsView->setStack(stack);