fix tray bug

src/mainwindow.cpp

@@ -125,6 +125,8 @@ void MainWindow::setupTrayIcon() {
 }
 
 void MainWindow::cleanTrayIcon() {
+  if (m_trayIcon == nullptr)
+    return;
   m_trayIcon->hide();
   m_trayIconMenu->deleteLater();
   m_trayIcon->deleteLater();

src/mainwindow.h

@@ -30,7 +30,7 @@ private:
   QWebEngineProfile *prepareProfile();
   DiscordPage *m_discordPage;
   void closeEvent(QCloseEvent *event) override;
-  QSystemTrayIcon *m_trayIcon;
+  QSystemTrayIcon *m_trayIcon = nullptr;
   QMenu *m_trayIconMenu;
   QSettings *m_settings;
   bool m_wasMaximized;