Why does other user stay logged in on seat0 and prevent me to hibernate?

Using openSUSE Leap 15.1 with KDE. I log in as user1 then switch to user2 and log that on off again. Hibernating as user1 was until recently no problem (if I logged off user2). But now I get this: $ systemctl hibernate User user2 is logged in on seat0. Please retry operation after closing inhibitors and logging out other users. Alternatively, ignore inhibitors and users with 'systemctl hibernate -i'. The w- and users-commands show only user1. $ users user1 user1 $ w 10:24:52 up 30 min, 2 users, load average: 0,32, 0,22, 0,23 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT user1 tty7 :0 09:56 30:37 34.94s 0.03s /bin/sh /usr/bin/startkde user1 pts/0 :0 10:03 4.00s 0.04s 0.00s w loginctl shows $ loginctl SESSION UID USER SEAT TTY 2 1000 user1 seat0 4 1001 user2 seat0 6 1000 user1 seat0 Why is that? And how can I get back to the hasslefree previous behavior? **EDIT:** I know I can do sudo loginctl kill-session 4. But that is just dealing with a reappearing problem I want to go for good.