SQL/PostgreSQL - Error observed in the QUERY not caught by the “EXCEPTION” block in the stored procedure

I am trying to create a stored procedure to be used in a PostgreSQL DBMS.

The purpose of this stored procedure is to delete all records that present the following problem...

Query:

`
my_database=# SELECT file INTO my_file_now FROM public.my_datatable WHERE my_id='2fdf5297-8d4a-38bc-bb26-b8a4b7ba47ec';
ERROR:  missing chunk number 0 for toast value 3483039 in pg_toast_3473493
`

Based on the above behavior I created the following stored procedure:

Stored procedure:

`
DO $f$
DECLARE
    my_file_now BYTEA;
    my_id_now UUID;
BEGIN
FOR my_id_now IN SELECT my_id FROM public.my_datatable LOOP
    BEGIN
        SELECT file
            INTO my_file_now
            FROM public.my_datatable WHERE my_id=my_id_now;
        EXCEPTION
            WHEN OTHERS THEN
            RAISE NOTICE 'CORRUPTED MY_ID - % ', my_id_now;
            DELETE FROM public.my_datatable WHERE my_id=my_id_now;
    END;
END LOOP;
END;
$f$;
`

QUESTION: Why is the error observed in the query not caught by the "EXCEPTION" block in the stored procedure?

Thanks! =D
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