Issue temp_dir error in psa-roundcube log

[uniauto]

Server operating system version

Debian 10.13

Plesk version and microupdate number

Plesk Obsidian 18.0.48

Hello.

Since Plesk update to 18.0.46 I see some errors about temp_dir in /var/log/psa-roundcube/errors

PHP Warning: opendir(/usr/share/psa-roundcube//var/tmp): failed to open dir: No existe el fichero o el directorio in /usr/share/psa-roundcube/program/lib/Roundcube/rcube.php on line 528
PHP Error: Detected 'temp_dir' change. Access to '/usr/share/psa-roundcube//var/tmp' restricted by filesystem permissions or open_basedir in /usr/share/psa-roundcube/plugins/filesystem_attachments/filesystem_attachments.php on line 234

temp_dir in /usr/share/psa-roundcube/config/defaults.inc.php is:

$config['temp_dir'] = RCUBE_INSTALL_PATH . '/var/tmp';

Whats wrong? Should I remove RCUBE_INSTALL_PATH from temp_dir?