[PDO] Integrity constraint violation

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails (`sma`.`episodes`, CONSTRAINT `episodes_ibfk_1` FOREIGN KEY (`show_id`) REFERENCES `shows` (`id`))

CREATE TABLE IF NOT EXISTS shows (
	id					int unsigned				not null	AUTO_INCREMENT,
	tvdb_id				int unsigned,
	bd_id				int unsigned,
	name				varchar(200)				not null,
	date_added			datetime					not null,
	PRIMARY KEY(id),
	UNIQUE KEY(tvdb_id, bd_id)
) ENGINE=INNODB;

CREATE TABLE episodes (
	id 					bigint unsigned				not null 	AUTO_INCREMENT,
	show_id				int unsigned				not null,
	season				tinyint unsigned			not null,
	episode				tinyint unsigned			not null,
	date_added			datetime					not null,
	PRIMARY KEY(id),
	INDEX(show_id),
	FOREIGN KEY (show_id) REFERENCES shows (id) ON UPDATE CASCADE ON DELETE RESTRICT
) ENGINE=INNODB;

			$insertNewEpisode			= 'INSERT INTO episodes (show_id, season, episode, date_added) VALUES
										(:show_id, :bierdopje_season, :bierdopje_episode, now())';