diff --git a/frame/panel/mainpanelcontrol.cpp b/frame/panel/mainpanelcontrol.cpp
index b40bc3bcc..b583b9ce5 100755
--- a/frame/panel/mainpanelcontrol.cpp
+++ b/frame/panel/mainpanelcontrol.cpp
@@ -677,8 +677,9 @@ void MainPanelControl::mousePressEvent(QMouseEvent *e)
     QWidget::mousePressEvent(e);
 }
 
-void MainPanelControl::startDrag(DockItem *item)
+void MainPanelControl::startDrag(DockItem *dockItem)
 {
+    QPointer<DockItem> item = dockItem;
     const QPixmap pixmap = item->grab();
 
     item->setDraging(true);
@@ -692,7 +693,7 @@ void MainPanelControl::startDrag(DockItem *item)
 
         connect(m_appDragWidget, &AppDragWidget::destroyed, this, [ = ] {
             m_appDragWidget = nullptr;
-            if (qobject_cast<AppItem *>(item)->isValid()) {
+            if (!item.isNull() && qobject_cast<AppItem *>(item)->isValid()) {
                 if (-1 == m_appAreaSonLayout->indexOf(item) && m_dragIndex != -1) {
                     insertItem(m_dragIndex, item);
                     m_dragIndex = -1;