txrep duplicated key with postgresql

[Benny Pedersen]

2019-12-09 12:07:53.477 UTC [16458] DETAIL:  Key (username, email, 
signedby, ip)=(u...@example.org, u...@example.com, example.com, none) 
already exists.
2019-12-09 12:07:53.477 UTC [16458] STATEMENT:  INSERT INTO txrep 
(username,email,ip,count,totscore,signedby) VALUES ($1,$2,$3,$4,$5,$6)
2019-12-09 12:07:53.479 UTC [16459] ERROR:  duplicate key value violates 
unique constraint "txrep_pkey"

--
-- PostgreSQL database dump
--

-- Dumped from database version 11.4
-- Dumped by pg_dump version 11.4

SET statement_timeout = 0;
SET lock_timeout = 0;
SET idle_in_transaction_session_timeout = 0;
SET client_encoding = 'UTF8';
SET standard_conforming_strings = on;
SELECT pg_catalog.set_config('search_path', '', false);
SET check_function_bodies = false;
SET xmloption = content;
SET client_min_messages = warning;
SET row_security = off;

SET default_tablespace = '';

SET default_with_oids = false;

--
-- Name: txrep; Type: TABLE; Schema: public; Owner: spamassassin
--

CREATE TABLE public.txrep (
    username character varying(100) DEFAULT ''::character varying NOT 
NULL,
    email character varying(255) DEFAULT ''::character varying NOT NULL,
    ip character varying(40) DEFAULT ''::character varying NOT NULL,
    count bigint DEFAULT '0'::bigint NOT NULL,
    totscore double precision DEFAULT '0'::double precision NOT NULL,
    signedby character varying(255) DEFAULT ''::character varying NOT 
NULL,
    last_hit timestamp without time zone DEFAULT CURRENT_TIMESTAMP NOT 
NULL
)
WITH (fillfactor='95');


ALTER TABLE public.txrep OWNER TO spamassassin;

--
-- Name: txrep txrep_pkey; Type: CONSTRAINT; Schema: public; Owner: 
spamassassin
--

ALTER TABLE ONLY public.txrep
    ADD CONSTRAINT txrep_pkey PRIMARY KEY (username, email, signedby, 
ip);


--
-- Name: txrep_last_hit; Type: INDEX; Schema: public; Owner: 
spamassassin
--

CREATE INDEX txrep_last_hit ON public.txrep USING btree (last_hit);


--
-- Name: txrep update_txrep_update_last_hit; Type: TRIGGER; Schema: 
public; Owner: spamassassin
--

CREATE TRIGGER update_txrep_update_last_hit BEFORE UPDATE ON 
public.txrep FOR EACH ROW EXECUTE PROCEDURE 
public.update_txrep_last_hit();


--
-- PostgreSQL database dump complete
--


how to solve this ?