diff --git a/src/plugins/qmlprofiler/flamegraphmodel.cpp b/src/plugins/qmlprofiler/flamegraphmodel.cpp
index f5664dc5df0..f9d0f365f47 100644
--- a/src/plugins/qmlprofiler/flamegraphmodel.cpp
+++ b/src/plugins/qmlprofiler/flamegraphmodel.cpp
@@ -222,7 +222,8 @@ QModelIndex FlameGraphModel::parent(const QModelIndex &child) const
 {
     if (child.isValid()) {
         FlameGraphData *childData = static_cast<FlameGraphData *>(child.internalPointer());
-        return createIndex(0, 0, childData->parent);
+        return childData->parent == &m_stackBottom ? QModelIndex() :
+                                                     createIndex(0, 0, childData->parent);
     } else {
         return QModelIndex();
     }
diff --git a/src/plugins/qmlprofiler/flamegraphmodel.h b/src/plugins/qmlprofiler/flamegraphmodel.h
index 0b42aa39468..3b130faaa1c 100644
--- a/src/plugins/qmlprofiler/flamegraphmodel.h
+++ b/src/plugins/qmlprofiler/flamegraphmodel.h
@@ -74,10 +74,11 @@ public:
 
     FlameGraphModel(QmlProfilerModelManager *modelManager, QObject *parent = 0);
 
-    QModelIndex index(int row, int column, const QModelIndex &parent) const override;
+    QModelIndex index(int row, int column,
+                      const QModelIndex &parent = QModelIndex()) const override;
     QModelIndex parent(const QModelIndex &child) const override;
     Q_INVOKABLE int rowCount(const QModelIndex &parent = QModelIndex()) const override;
-    int columnCount(const QModelIndex &parent) const override;
+    Q_INVOKABLE int columnCount(const QModelIndex &parent = QModelIndex()) const override;
     QVariant data(const QModelIndex &index, int role) const override;
     QHash<int, QByteArray> roleNames() const override;
     QmlProfilerModelManager *modelManager() const;