Subquery in insertInto fails with "TypeError: Converting circular structure to JSON"

[phiresky]

const id = 123;
await db.single(
        sql
            .insertInto(a)
            .value({
                id,
                foo: sql
                    .from(bar)
                    .where({ id })
                    .select(bar.x)
                    .asExpression()
            })
    );

creates a query like

INSERT INTO roulette.games(id, foo) VALUES ($1, $2)

Trying to pass the inner query directly to pg.