Quick question: Is this a plasma or putty bug?
My suspicion is putty, but before chasing someone down, better ask first.
And before you ask, I need putty for testing reasons. 
From journalctl
17:29:12.184 UTC user@1000.service qt.qml.context: qrc:/LogView.qml:287:5 Parameter "event" is not declared. Injection of parameters into signal handlers is deprecated. Use JavaScript functions with formal parameters instead.
17:29:50.831 UTC user@1000.service file:///usr/share/plasma/plasmoids/org.kde.plasma.kicker/contents/ui/ItemListView.qml:153: TypeError: Cannot read property 'forceActiveFocus' of null
17:29:52.595 UTC user@1000.service file:///usr/share/plasma/plasmoids/org.kde.plasma.kicker/contents/ui/ItemListView.qml:153: TypeError: Cannot read property 'forceActiveFocus' of null
17:29:57.742 UTC user@1000.service app-putty@89c7874a849745a5a6a539fbfe6dec50.service: Main process exited, code=exited, status=1/FAILURE
17:29:57.742 UTC user@1000.service app-putty@89c7874a849745a5a6a539fbfe6dec50.service: Failed with result 'exit-code'.
Thanks in advance.