diff --git a/frame/item/appitem.cpp b/frame/item/appitem.cpp
index b10b627c7..fc7c39a95 100644
--- a/frame/item/appitem.cpp
+++ b/frame/item/appitem.cpp
@@ -36,6 +36,10 @@ AppItem::AppItem(const QDBusObjectPath &entry, QWidget *parent)
       m_itemScene(new QGraphicsScene(this)),
 
       m_draging(false),
+
+      m_smallIcon(QPixmap()),
+      m_largeIcon(QPixmap()),
+
       m_horizontalIndicator(QPixmap(":/indicator/resources/indicator.png")),
       m_verticalIndicator(QPixmap(":/indicator/resources/indicator_ver.png")),
       m_activeHorizontalIndicator(QPixmap(":/indicator/resources/indicator_active.png")),
@@ -251,8 +255,11 @@ void AppItem::paintEvent(QPaintEvent *e)
 
     // icon
     const QPixmap pixmap = DockDisplayMode == Efficient ? m_smallIcon : m_largeIcon;
+    if (pixmap.isNull())
+        return;
+
     // icon pos
-    QPointF iconPos = itemRect.center() - QRectF(pixmap.rect()).center();
+    const QPointF iconPos = itemRect.center() - QRectF(pixmap.rect()).center();
 
     // draw ligher/normal icon
     if (!m_hover)
diff --git a/plugins/network/item/wireditem.h b/plugins/network/item/wireditem.h
index 50f1823cc..23524f523 100644
--- a/plugins/network/item/wireditem.h
+++ b/plugins/network/item/wireditem.h
@@ -14,18 +14,18 @@ class WiredItem : public DeviceItem
 public:
     explicit WiredItem(const QUuid &deviceUuid);
 
-    NetworkDevice::NetworkType type() const;
-    NetworkDevice::NetworkState state() const;
-    QWidget *itemPopup();
+    NetworkDevice::NetworkType type() const override;
+    NetworkDevice::NetworkState state() const override;
+    QWidget *itemPopup() override;
     const QString itemCommand() const override;
 
 protected:
-    void paintEvent(QPaintEvent *e);
-    void resizeEvent(QResizeEvent *e);
-    void mousePressEvent(QMouseEvent *e);
+    void paintEvent(QPaintEvent *e) override;
+    void resizeEvent(QResizeEvent *e) override;
+    void mousePressEvent(QMouseEvent *e) override;
 
 private slots:
-    void refreshIcon();
+    void refreshIcon() override;
     void reloadIcon();
     void activeConnectionChanged(const QUuid &uuid);
     void deviceStateChanged(const NetworkDevice &device);