Error 500 if _embed=1 parameter is provided

In our site I’ve checked that _embed=1 parameter is added to the REST API URL, a fatal error is generated:

PHP Fatal error:  Uncaught Error: Call to undefined method WP_Error::get_matched_route() in /var/www/html_dev5/wp-includes/rest-api.php:765
Stack trace:
#0 /var/www/html_dev5/wp-includes/class-wp-hook.php(303): rest_send_allow_header(Object(WP_Error), Object(WP_REST_Server), Object(WP_REST_Request))
#1 /var/www/html_dev5/wp-includes/plugin.php(189): WP_Hook->apply_filters(Object(WP_Error), Array)
#2 /var/www/html_dev5/wp-includes/rest-api/class-wp-rest-server.php(701): apply_filters('rest_post_dispa...', Object(WP_Error), Object(WP_REST_Server), Object(WP_REST_Request))
#3 /var/www/html_dev5/wp-includes/rest-api/class-wp-rest-server.php(551): WP_REST_Server->embed_links(Array, true)
#4 /var/www/html_dev5/wp-includes/rest-api/class-wp-rest-server.php(474): WP_REST_Server->response_to_data(Object(WP_REST_Response), true)
#5 /var/www/html_dev5/wp-includes/rest-api.php(370): WP_REST_Server->serve_request('/wp/v2/posts')
#6 /var/www/html_dev5/wp-includes/class-wp-hook.php(303): rest_api_loaded(Object(WP))
#7 /var/www/html_dev5/wp-i in /var/www/html_dev5/wp-includes/rest-api.php on line 765

For example, the URL that generates the error is:
/wp-json/wp/v2/posts?_embed=1&post_type=post:page&per_page=6&search=blog

If I deactivate the REST API Toolbox plugin, that call returns the corresponding posts without any problem.

Also, the call:
/wp-json/wp/v2/posts?post_type=post:page&per_page=6&search=blog
works correctly without deactivating the plugin.

• This topic was modified 2 years, 8 months ago by David Marín Carre?o.