[i427c] GUI: fix for MR 1305 ()

Merging branch 'i427c'  into 'main'.

See merge request !1311

GUI/View/SampleDesigner/SampleListView.cpp

@@ -219,8 +219,10 @@ void SampleListView::restoreSelection()
         selected = m_model->rowCount() - 1;
 
     QModelIndex selectedIndex = m_model->index(selected, 0, QModelIndex());
-    selectionModel()->select(selectedIndex, QItemSelectionModel::ClearAndSelect);
-    setCurrentSample(m_document->sampleModel()->sampleItems()[selected]);
+    if (selectedIndex.isValid()) {
+        selectionModel()->select(selectedIndex, QItemSelectionModel::ClearAndSelect);
+        setCurrentSample(m_document->sampleModel()->sampleItems()[selected]);
+    }
 }
 
 void SampleListView::removeSample(SampleItem* item)