Steps to reproduce the crash: $ sudo -i # cd /usr/share/applications # sleep 10; mv firefox.desktop firefox.desktop.123; mv firefox.desktop.123 firefox.desktop Open the application menu via the panel plugin or xfdesktop, navigate to the "Internet" category and wait until the second command has finished. Move the mouse cursor. (xfdesktop:1367): GLib-GObject-WARNING **: 19:09:04.534: invalid uninstantiatable type '(null)' in cast to 'GarconMenuItemAction' (xfdesktop:1367): garcon-CRITICAL **: 19:09:04.534: garcon_menu_item_action_get_name: assertion 'GARCON_IS_MENU_ITEM_ACTION (action)' failed (xfdesktop:1367): GLib-GObject-WARNING **: 19:09:04.534: invalid uninstantiatable type '(null)' in cast to 'GarconMenuItemAction' (xfdesktop:1367): garcon-CRITICAL **: 19:09:04.534: garcon_menu_item_action_get_name: assertion 'GARCON_IS_MENU_ITEM_ACTION (action)' failed
Maybe related: https://git.xfce.org/panel-plugins/xfce4-whiskermenu-plugin/commit/?id=2fb2ec5a0fd031ad7ff377a86e8fd0e06c83ab94
Andre Miranda referenced this bugreport in commit 6f452937366bb1599fb0ae986958786d52946f15 Fix use after free crash (Bug #15679) https://git.xfce.org/xfce/garcon/commit?id=6f452937366bb1599fb0ae986958786d52946f15
*** Bug 15334 has been marked as a duplicate of this bug. ***