The following function at the end my cpt file.
I get an undefined index “_post_meta” .
error is still happening when I revert to previously working version of wordpress.

function tribute_new_title($data, $post_array) {
$new_title = $post_array[‘_post_meta’][‘fn_text’] . ” ” . $post_array[‘_post_meta’][‘ln_text’];
return $post_array[‘post_type’] == ‘tribute’ ? $new_title : $post_array[‘post_title’];
}
add_filter(‘piklist_empty_post_title’, ‘tribute_new_title’, 10, 2);