更新后MYSQL触发器出错

Question

嗨我有mysql触发器的问题这是我的代码，出现的错误是这样的： Error1064：插入附近的MYSQL sintax中有错误...

CREATE TRIGGER TRIGGER_HISTORIALES AFTER UPDATE ON BOARD
    FOR EACH ROW BEGIN 
    IF (OLD.IMEI != NEW.IMEI)
    INSERT INTO HISTORIAL_CAMBIO_IMEI (HISTORIAL_CAMBIO_ID,FECHA,BOARD_ID,IMEI_ANTERIOR,IMEI_NUEVO)
    VALUES
    (NULL,SYSDATE(),SELECT BOARD_ID FROM BOARD WHERE IMEI=OLD.IMEI,SYSDATE(),OLD.IMEI,NEW.IMEI);
    END IF
    END