Setting spellcheck_dictionary = shared cause application failure

[cmonty14]

Prerequisites

• I have searched for duplicate or closed issues
• I can recreate the issue with all plugins disabled

Describe the issue

Activating this option in /etc/roundcube/config.inc.php

// Enables spellchecker exceptions dictionary.
// Setting it to 'shared' will make the dictionary shared by all users.
$config['spellcheck_dictionary'] = shared;

causes the application failure.

What browser(s) are you seeing the problem on?

Chrome, Edge

What version of PHP are you using?

v8.2

What version of Roundcube are you using?

1.6.5

JavaScript errors

No response

PHP errors

2025/01/10 14:45:07 [error] 180309#180309: *1963 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught Error: Undefined constant "shared" in /etc/roundcube/config.inc.php:91
Stack trace:
#0 /usr/share/roundcube/program/lib/Roundcube/rcube_config.php(313): include()
#1 /usr/share/roundcube/program/lib/Roundcube/rcube_config.php(202): rcube_config->load_from_file()
#2 /usr/share/roundcube/program/lib/Roundcube/rcube_config.php(97): rcube_config->load()
#3 /usr/share/roundcube/program/lib/Roundcube/rcube.php(117): rcube_config->__construct()
#4 /usr/share/roundcube/program/include/rcmail.php(91): rcube->__construct()
#5 /usr/share/roundcube/index.php(43): rcmail::get_instance()
#6 {main}
thrown in /etc/roundcube/config.inc.php on line 91" while reading response header from upstream, client: 2a00:fe00:6d47:b67a:aa98:908c:ba02:fc06, server: webmail.biszumbitterenen.de, request: "GET /?_task=mail&_mbox=INBOX HTTP/2.0", upstream: "fastcgi://unix:/run/php/php-fpm.sock:", host: "webmail.biszumbitterenen.de", referrer: "https://webmail.biszumbitterenen.de/?_task=settings&_action=preferences"