ksmserver errors after updating to Plasma 5.9.5

[Jonathan Riddell]

Anyone have experience of this bug? seems to be a regression in 5.9.5

https://bugs.kde.org/show_bug.cgi?id=379254

possible guilty commits

https://cgit.kde.org/plasma-workspace.git/commit/?h=Plasma/5.9&id=c7d21ae2b834bd101d8dba1edaea05edcdb6e8f5

https://cgit.kde.org/plasma-workspace.git/commit/?h=Plasma/5.9&id=da44dd6eae8b9ef4161680efcb9319a7267fe77e