PHP Warning with Roundcube 1.5.2 and 8.0.14

[STR07]

I get a warning when using Roudcube 1.5.2 and the plugin: lastlogin with PHP 8.0.14.

The following warning occurs at login and logout with the lastlogin-plugin and only exists since the PHP 8.0.14. update.

[02-Jan-2022 19:35:20 Europe/Berlin] PHP Warning: Undefined array key "plugin.lastlogin.show_info" in /var/www/html/webmail/plugins/lastlogin/lastlogin.php on line 216

Thank you very much in advance.

[STR07]

Ps: We are currently using version 1.3.0 of lastlogin

[kenokallinger]

To fix this warning change line 216 to the following:

return $_SESSION['plugin.lastlogin.show_info'] ?? null;