query has no destination for result data

One of my plpgsql functions is now throwing this error:

select * from genome_threshold_mono('11-O3C.pbs','1-O3C_chr',1.96, 1000000);

NOTICE:  group id is 5eed8d65-d39a-4f72-97a3-ca391b84880d

NOTICE:  New threshold: 66128154-d128-4e66-bb8e-e9c9ee5ae89d

NOTICE:  doing chrom 11

NOTICE:  2019-03-06 00:21:17.253375-07: markerset id is 9a8f7487-bd64-4d43-9adf-5ae1c6744e60(1-O3C_chr11.Loci.ld), people (5eed8d65-d39a-4f72-97a3-ca391b84880d) id is 11-O3C.pbs

NOTICE:  table "collected" does not exist, skipping

NOTICE:  table "mrkidx" does not exist, skipping

NOTICE:  2019-03-06 00:21:17.295142-07: working with 28607 markers

NOTICE:  2019-03-06 00:21:17.383835-07: added 3514 segments to imputed_pvalue_t

ERROR:  query has no destination for result data

HINT:  If you want to discard the results of a SELECT, use PERFORM instead.

CONTEXT:  PL/pgSQL function optimal_pvalue_mono(text,text,integer,double precision,integer) line 65 at SQL statement

SQL statement "insert into goptset

        select * from optimal_pvalue_mono(people_name, mvec.name, mvec.chrom, conf, maxi)"

PL/pgSQL function genome_pvalue_mono(text,text,double precision,integer) line 19 at SQL statement

SQL statement "insert into threshold_segment(id,threshold_id, segment_id, smooth_pvalue)

         select uuid_generate_v4(), tid, f.segment_id, f.pval

         from genome_pvalue_mono(pbs_name, markers_rx, conf, maxi) as f"

PL/pgSQL function genome_threshold_mono(text,text,double precision,integer) line 30 at SQL statement

    54  for segp in

    55    select s.id, s.firstmarker, s.lastmarker, 

    56           v.ipv,

    57           array_length(p.probands,1) as pbs,

    58           s.lastmarker - s.firstmarker as mks

    59    from segment s 

    60         join imputed_pvalue_t v on s.id = v.segment_id

    61         join probandset p on s.probandset_id = p.id

    62         join probandset_group_member m on p.id = m.member_id

    63    where s.markerset_id = mkset

    64          and m.group_id = pbsgid

    65    order by ipv, pbs, mks

    66  LOOP

Plugging in the appropriate values for an example run generates a proper dataset (~1300 rows)as far as I can tell.