[Plugin: polylang-slug AND Polylang]

I encountered a problem…

I used this code:

add_filter('pre_get_posts', 'get_default_language_posts');

function get_default_language_posts($query) {
    if ($query->is_main_query() && function_exists('pll_default_language') && !is_admin()) {
        $terms = get_terms('post_translations'); //polylang stores translated post IDs in a serialized array in the description field of this custom taxonomy
        $defLang = pll_default_language(); //default lanuage of the blog
        $curLang = pll_current_language(); //current selected language requested on the broswer
        $filterPostIDs = array();
        foreach ($terms as $translation) {
            $transPost = unserialize($translation->description);
            //if the current language is not the default, lets pick up the default language post
            if ($defLang != $curLang)
                $filterPostIDs[] = $transPost[$defLang];
        }
        if ($defLang != $curLang) {
            $query->set('lang', $defLang . ',' . $curLang);  //select both default and current language post
            $query->set('post__not_in', $filterPostIDs); // remove the duplicate post in the default language
        }
    }
    return $query;
}

To mix Posts – the default language with the current language.

Since I am using Polylang-slug from grappler: https://github.com/grappler/polylang-slug

It does not work anymore,.. is there any work around? Cuz both are needed !!