Cssmin not minifying css files

Hi everyone, I'm trying to join some css files to apply the Cssmin filter, this is the snippet

$this->assets
            ->collection('styles')
            ->setTargetPath('css/common.min.css')
            ->setTargetUri("css/common.min.css?v={$this->version}")
            ->AddCss('css/styles.css', true, true)
            ->join(true)
            ->addFilter(
                new \Phalcon\Assets\Filters\Cssmin()
            );

I'm running php 7.2 on CentOs 7. For some reason, if I try to minify the css, I get an error page: https://postimg.cc/v1qzDV66 But if I just remove the minification filter it works just fine, I enabled php errors, and I got nothing. On the apache error logs I got this: [Tue Nov 06 11:47:10.309265 2018] [core:notice] [pid 13071:tid 140264820119680] AH00052: child pid 16449 exit signal Segmentation fault (11)

Does Cssmin require any library? I can't find a list of requirements.

edited 3h ago

It is because you're using uis package. Remi Collet (a rpm packages maintainer) meddle in the extension building process and deletes the necessary files. Probably you should email him and ask a possible workaround. Or build phalcon from the source to get a full version. This story begins here: https://github.com/phalcon/cphalcon/issues/10118