I have my plasma5 taskbar setup without the VirtualDesktop widget, but i still use 4 different virtual desktops. When looking at the journal, i have plenty of entries like this: Mar 28 23:44:55 T470 plasmashell[4130]: file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/ToolTipInstance.qml:437: ReferenceError: VirtualDesktop is not defined Is this related to the missing widget? If so, a check if VirtualDesktop is really defined before accessing it would be very nice...
It's not related to the widget.
*** This bug has been marked as a duplicate of bug 391595 ***