Display default language post

Hi!

Can anyone could help me with the trouble of showing posts only in the default language?

Thanks!

This is what the debug returned

Notice: Use of undefined constant E_USER_DEPRECATED - assumed 'E_USER_DEPRECATED' in /usr/home/suvisa/www/wordpress/wp-content/plugins/codestyling-localization/codestyling-localization.php on line 2491

Notice: Trying to get property of non-object in /usr/home/suvisa/www/wordpress/wp-content/themes/kallyas/header.php on line 147

I don’t know why but now does not show the blank page, but still doesn’t show the default post…

The code i put in the functions.php with the Functionality plugin is this:

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;
}

Thanks for your help!