Returning empty on insert

Hi all,

when running query below, pid returns empty when inserting new record

WITH s AS (
SELECT pid FROM test WHERE area = 'test5'
), i AS (
INSERT INTO test (area)
SELECT 'test5'
WHERE NOT EXISTS (SELECT 1 FROM s)
RETURNING pid
)
UPDATE area
SET last_update = CURRENT_TIMESTAMP
WHERE pid = (SELECT pid FROM s)
RETURNING pid;

what I missed?

please help

many thanks in advance

Regards

Win