diff --git a/applets/systemtray/systemtray.cpp b/applets/systemtray/systemtray.cpp
--- a/applets/systemtray/systemtray.cpp
+++ b/applets/systemtray/systemtray.cpp
@@ -163,6 +163,10 @@
     connect(this, &QObject::destroyed, desktopMenu, &QMenu::close);
     desktopMenu->setAttribute(Qt::WA_DeleteOnClose);
 
+    if (appletInterface->window() && appletInterface->window()->mouseGrabberItem()) {
+        appletInterface->window()->mouseGrabberItem()->ungrabMouse();
+    }
+
     emit applet->contextualActionsAboutToShow();
     foreach (QAction *action, applet->contextualActions()) {
         if (action) {