ERROR: ERROR: query has no destination for result data

Question

I have developped a procedure in my postgresql DB that sends an email to someone, my procedure works well when it was like that :

CREATE OR REPLACE PROCEDURE fond_plan.send_mail_approche_date(
    )
LANGUAGE 'plpgsql'

AS $BODY$DECLARE
    test integer NOT NULL DEFAULT 0;

BEGIN

    perform pgmail('my_email', 'another_email', 'its working', 'its working', '');

END IF;
END;$BODY$;

However when I added some SELECT to it, now it looks like that :

CREATE OR REPLACE PROCEDURE fond_plan.send_mail_approche_date(
    )
LANGUAGE 'plpgsql'

AS $BODY$DECLARE
    test integer NOT NULL DEFAULT 0;
BEGIN

SELECT * FROM fond_plan.arretes_de_voiries_evw;

IF date(date_debut) = CURRENT_DATE AND statut = 'En instruction collectivité' THEN

    perform pgmail('my_email', 'another_email', 'its working', 'its working', '');

END IF;
END;$BODY$;

So now when I run :

CALL fond_plan."send_mail_approche_date"()

I get the following error :

ERROR: ERROR: query has no destination for result data
HINT: If you want to override the results of a SELECT, use PERFORM instead.
CONTEXT: PL/pgsql function fond_plan.send_mail_approach_date(), line 5 to SQL statement