Fatal error: Uncaught Error: Cannot use object of type WP_Term as array

Warning:  count(): Parameter must be an array or an object that implements Countable in ...\wp-content\plugins\wp-rest-cache\includes\caching\class-caching.php on line 714
Fatal error:  Uncaught Error: Cannot use object of type WP_Term as array in ...\wp-content\plugins\wp-rest-cache\includes\caching\class-caching.php:714
Stack trace:
#0 ...\wp-content\plugins\wp-rest-cache\includes\caching\class-caching.php(591): WP_Rest_Cache_Plugin\Includes\Caching\Caching->determine_object_type(Array)
#1 ...\wp-content\plugins\wp-rest-cache\includes\caching\class-caching.php(130): WP_Rest_Cache_Plugin\Includes\Caching\Caching->register_endpoint_cache('e7df5ea64a70d54...', Array, '/wordpress/wp-j...')
#2 ...\wp-content\plugins\wp-rest-cache\includes\api\class-endpoint-api.php(153): WP_Rest_Cache_Plugin\Includes\Caching\Caching->set_cache('e7df5ea64a70d54...', Array, 'endpoint', '/wordpress/wp-j...')
#3 ...\wp-includes\class-wp-hook.php(286): WP_Rest_Cache_Plugin\Includes\API in ...\wp-content\plugins\wp-rest-cache\includes\caching\class-caching.php on line 714

I tried to get this (…/extended/v1/menus/header_menu):

object(WP_Term)#4181 (11) {
	["term_id"]=>
	int(848999)
	["name"]=>
	string(23) "Main munu"
	["slug"]=>
	string(67) "main-menu"
	["term_group"]=>
	int(0)
	["term_taxonomy_id"]=>
	int(848999)
	["taxonomy"]=>
	string(8) "nav_menu"
	["description"]=>
	string(0) ""
	["parent"]=>
	int(0)
	["count"]=>
	int(7)
	["filter"]=>
	string(3) "raw"
	["items"]=>
	array(5) {
		[0]=>
		&object(stdClass)#4183 (17) {
			["ID"]=>
			int(181235)
			["post_content"]=>
			string(0) ""
			["post_title"]=>
			string(14) "Home"
			["post_excerpt"]=>
			string(0) ""
			["comment_status"]=>
			string(6) "closed"
			["post_name"]=>
			string(8) "home"
			["menu_order"]=>
			int(1)
			["comment_count"]=>
			string(1) "0"
			["menu_item_parent"]=>
			string(1) "0"
			["type"]=>
			string(6) "custom"
			["type_label"]=>
			string(37) ""
			["title"]=>
			string(14) ""
			["url"]=>
			string(24) ""
			["attr_title"]=>
			string(0) ""
			["description"]=>
			string(0) ""
			["classes"]=>
			array(1) {
				[0]=>
				string(0) ""
			}
			["items"]=>
			array(0) {
			}
		}
	}
}