Ticket #26937: 26937.3.diff

src/wp-includes/link-template.php

@@ -1305 +1305 @@
                         'update_post_term_cache' => false,
                         'update_post_meta_cache' => false,
                         'split_the_query'        => wp_using_ext_object_cache(),
+                        'fields'                 => 'ids',
                 );
 
                 $tax_query = array();
@@ -1375 +1376 @@
                 $query = new WP_Query( $query_args );
 
                 if ( $query->posts ) {
-                        $this->adjacent_post = $query->post;
+                        $post_id = reset( $query->posts );
+                        $this->adjacent_post = get_post( $post_id );
                 } else {
                         $this->adjacent_post = false;
                 }