Something

kwin(24674)/kdeui (KNotification) KNotification::~KNotification: 0
process 24674: arguments to dbus_pending_call_set_notify() were incorrect, assertion "pending != NULL" failed in file dbus-pending-call.c line 598.
This is normally a bug in some application using the D-Bus library.

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Now my desktop is unusable due to dead dbus session...