xfce4-popup-whiskermenu only works every second time

The issue is present in 2.6.1, 2.6.0 still worked. I have a desktop shortcut to open whiskermenu via 'xfce4-popup-whiskermenu'. When opening the menu and then closing it via 'ESC' a subsequent opening does not work but the third opening will work again. When closing the menu via the shortcut (xfce4-popup-whiskermenu) the behaviour is as expected.