I use #i3wm inside #KDE session. For some time I'm unable to log out. Here's the bug report: https://bugs.kde.org/show_bug.cgi?id=488277
There is a workaround: https://github.com/DMaroo/fakwin
And here's my package for #openSUSE: https://build.opensuse.org/package/show/home:etamPL/fakwin