Changing the prefix to empty in advanced config breaks the dashboard

[enthuzy]

Platform: AlmaLinux v8.8.0 STANDARD virtuozzo
Server type: Apache/2.4.57
PHP version: 8.1
LinkStack version: `4.0.2'

Changing the below setting to empty breaks the dashboard and preview on the default page (results in 404 error).

// The URL prefix is the symbol that comes before a LinkStack URL.
    // For example the '@' in 'example.com/@admin'.
    // If empty no prefix is required.
    'custom_url_prefix' => '+',

[JulianPrieber]

Fixed in v4.0.4-beta-2