Cannot switch users

[Anna]

After update to 24.04 I cannot change to user B while user A is still logged in.
There's a message in /var/log/syslog: "indicator-sessi[3021]: my_switch_to_username: assertion 'p->dm_seat != NULL' failed"

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: indicator-session 17.3.20+21.10.20210613.1-0ubuntu3
ProcVersionSignature: Ubuntu 6.8.0-39.39-generic 6.8.8
Uname: Linux 6.8.0-39-generic x86_64
ApportVersion: 2.28.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon Aug 5 20:56:09 2024
InstallationDate: Installed on 2020-05-20 (1538 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
SourcePackage: indicator-session
UpgradeStatus: Upgraded to noble on 2024-08-01 (4 days ago)