Nestd post grid inside Articles

Welcome to our forum.

Yes, post grid inside another post loop will create infinte loop that casue 500 http error.

you need to exclude current post id in pos grid query via filter hook, please see the fist example code in documentation

https://www.pickplugins.com/documentation/post-grid/filter-hooks/filters-post_grid_filter_query_args/

I hope this way your issue will solved.

Regards

function post_grid_filter_query_args_extra($query_args){
    
  $current_post_id = get_the_ID();
  
  $extra_query = array (

      'post__not_in' => array($current_post_id),

      );

  return array_merge($query_args, $extra_query);
  }

add_filter('post_grid_filter_query_args','post_grid_filter_query_args_extra');