diff --git a/src/piechart/piesliceitem.cpp b/src/piechart/piesliceitem.cpp
index db19d80..63611f0 100644
--- a/src/piechart/piesliceitem.cpp
+++ b/src/piechart/piesliceitem.cpp
@@ -109,7 +109,6 @@ void PieSliceItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * /*event*/)
 void PieSliceItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
 {
     emit clicked(event->buttons());
-    QGraphicsItem::mousePressEvent(event);
 }
 
 void PieSliceItem::setLayout(const PieSliceData &sliceData)
diff --git a/src/piechart/qpieseries.cpp b/src/piechart/qpieseries.cpp
index 4648747..0de443a 100644
--- a/src/piechart/qpieseries.cpp
+++ b/src/piechart/qpieseries.cpp
@@ -844,9 +844,11 @@ void QPieSeriesPrivate::sliceClicked()
 void QPieSeriesPrivate::sliceHovered(bool state)
 {
     QPieSlice *slice = qobject_cast<QPieSlice *>(sender());
-    Q_ASSERT(m_slices.contains(slice));
-    Q_Q(QPieSeries);
-    emit q->hovered(slice, state);
+    if (!m_slices.isEmpty()) {
+        Q_ASSERT(m_slices.contains(slice));
+        Q_Q(QPieSeries);
+        emit q->hovered(slice, state);
+    }
 }
 
 void QPieSeriesPrivate::initializeDomain()