diff -up hplip-3.9.8/ui4/systemtray.py.tray-icon-crash hplip-3.9.8/ui4/systemtray.py
--- hplip-3.9.8/ui4/systemtray.py.tray-icon-crash	2010-03-23 16:36:55.545632224 +0000
+++ hplip-3.9.8/ui4/systemtray.py	2010-03-23 16:37:51.944509885 +0000
@@ -489,6 +489,7 @@ class SystemTrayApp(QApplication):
         log.debug("Exiting")
         self.sendMessage('', '', EVENT_SYSTEMTRAY_EXIT)
         self.quit()
+        del self.tray_icon
 
 
     def toolboxTriggered(self):