diff -up hplip-3.10.2/ui4/systemtray.py.tray-icon-crash hplip-3.10.2/ui4/systemtray.py
--- hplip-3.10.2/ui4/systemtray.py.tray-icon-crash	2010-02-24 23:07:15.000000000 +0000
+++ hplip-3.10.2/ui4/systemtray.py	2010-03-23 16:42:24.476504861 +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):