Wrong result with aggregate with join with no result set

use test;

drop table if exists _Parent;

create table _Parent

(

	PARENT_ID int(10) unsigned NOT NULL AUTO_INCREMENT,

	PARENT_FIELD VARCHAR(10),

	PRIMARY KEY (PARENT_ID)

) engine=innodb;

drop table if exists _Child;

create table _Child

(

	CHILD_ID INT NOT NULL AUTO_INCREMENT,

	PARENT_ID INT NOT NULL,

	CHILD_FIELD varchar(10),

	PRIMARY KEY (CHILD_ID)

) engine=innodb;

INSERT INTO _Parent (PARENT_FIELD)

SELECT 'AAAA';

INSERT INTO _Child (PARENT_ID, CHILD_FIELD)

SELECT 1, 'BBBB';

select 

 _Parent.PARENT_ID,

 min(CHILD_FIELD)

 from _Parent straight_join _Child

 where _Parent.PARENT_ID = 1

 and _Parent.PARENT_ID = _Child.PARENT_ID

 and _Child.CHILD_FIELD = "ZZZZ";

+-----------+------------------+

| PARENT_ID | min(CHILD_FIELD) |

+-----------+------------------+

|         1 | NULL             |

+-----------+------------------+