How to exclude pages from WordPress search without breaking the admin panel?

Question

WordPress

Good!
I'm using the "Posts" type for the main content, and I want to exclude "Pages" from the search.
There is a great code for this:

// Удаляем с поиска страницы
function searchExcludePages($query) {
 if ($query->is_search) {
  $query->set('post_type', 'post');
 }
return $query;
 }
add_filter('pre_get_posts','searchExcludePages');

It works great on the site... BUT it breaks the admin functionality:
I'm linking a post to another custom post type.
And now the search is broken ...
QUESTION:
How can I make this code work only on the site and not affect the admin panel?
Thanks in advance!

Answer 1

function searchExcludePages($query) {
  if(!is_admin()){
    if ($query->is_search) {
      $query->set('post_type', 'post');
    }
  }
  return $query;
}
add_filter('pre_get_posts','searchExcludePages');