Error when trying to view Sessions in Administration Configuration Panel

[Bofus]

If one clicks on the "Sessions" on the lefthand side of the Configuration->Administration panel, Horde reponds with an error. This works on RC5, but latest build throws an error.

A fatal error has occurred
Backend does not support session iteration
in /var/www/horde/vendor/horde/sessionhandler/src/SessionHandler.php:146

1. require_once() /var/www/horde/web/horde/admin/sessions.php:3
2. Horde\SessionHandler\SessionAdministrator->listAll() /var/www/horde/vendor/horde/horde/admin/sessions.php:50
3. Horde\SessionHandler\SessionHandler->listSessions() /var/www/horde/vendor/horde/sessionhandler/src/SessionAdministrator.php:78

Details
The full error message is logged in Horde's log file, and is shown below only to administrators. Non-administrative users will not see error details.

Horde\SessionHandler\Exception\CapabilityException Object
(
[message:protected] => Backend does not support session iteration
[string:Exception:private] =>
[code:protected] => 0
[file:protected] => /var/www/horde/vendor/horde/sessionhandler/src/SessionHandler.php
[line:protected] => 146
[trace:Exception:private] => Array
(
[0] => Array
(
[file] => /var/www/horde/vendor/horde/sessionhandler/src/SessionAdministrator.php
[line] => 78
[function] => listSessions
[class] => Horde\SessionHandler\SessionHandler
[type] => ->
)

        [1] => Array
            (
                [file] => /var/www/horde/vendor/horde/horde/admin/sessions.php
                [line] => 50
                [function] => listAll
                [class] => Horde\SessionHandler\SessionAdministrator
                [type] => ->
            )

        [2] => Array
            (
                [file] => /var/www/horde/web/horde/admin/sessions.php
                [line] => 3
                [args] => Array
                    (
                        [0] => /var/www/horde/vendor/horde/horde/admin/sessions.php
                    )

                [function] => require_once
            )

    )

[previous:Exception:private] => 

)

[TDannhauer]

i thinnk i have the same. notr all session provide3r support iteration. What ist yur session config of horde?

[Bofus]

$conf['session']['name'] = 'Horde';
$conf['session']['use_only_cookies'] = true;
$conf['session']['timeout'] = 0;
$conf['session']['cache_limiter'] = 'nocache';
$conf['session']['max_time'] = 345600;
$conf['session']['key_format'] = 'hkdf-with-legacy-fallback';
$conf['session_whoami']['public'] = false;
$conf['sessionhandler']['type'] = 'Builtin';
$conf['sessionhandler']['hashtable'] = false;