Roundcube showing php source code

After working into the Apache configuration, I found the problem. The apache module mpm_prefork module was enabled, but the configuration file /etc/apache2/conf.d/hestia-event.conf, which handled the php-files, was configured for mpm_event_module:

<IfModule mpm_event_module>
    <FilesMatch \.php$>
        SetHandler "proxy:fcgi://127.0.0.1:9000"
    </FilesMatch>
</IfModule>

I just disabled mpm_prefork and enalbed mpm_event. Everything find now.

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