PG to MySQL Duplicate key

Whilst converting my 2.6GB postgres RT database 3.6.5 to mysql i get
the following error.

[root@bogan rt-3.6.5]# mysql -u root -p rt3 --ignore < /tmp/rt.sql6
Enter password:
ERROR 1062 (23000) at line 34107989: Duplicate entry ‘242710-28171’ for key 2

(line 34107989) INSERT INTO GroupMembers (id, groupid, memberid)
VALUES (199352, 242710, 28171);

Any ideas?

Cheers,
Kristian

mysql Ver 14.12 Distrib 5.0.66a, for redhat-linux-gnu (x86_64) using
readline 5.1

Further grep of the previous line too:
INSERT INTO groupmembers (id, groupid, memberid) VALUES (199351, 242710, 28171);
INSERT INTO groupmembers (id, groupid, memberid) VALUES (199352, 242710, 28171);

mysql> desc GroupMembers;
| Field | Type | Null | Key | Default | Extra |
| id | int(11) | NO | PRI | NULL | auto_increment |
| GroupId | int(11) | NO | MUL | 0 | |
| MemberId | int(11) | NO | | 0 | |

From prostgres

rt3=# select * from groupmembers where groupid=‘242710’;
id | groupid | memberid
199351 | 242710 | 28171
199352 | 242710 | 28171
(2 rows)

rt3=# \d groupmembers
Table "public.groupmembers"
Column | Type | Modifiers
id | integer | not null default nextval(‘groupmembers_id_seq’::regclass)
groupid | integer | not null default 0
memberid | integer | not null default 0
Indexes:
“groupmembers_pkey” PRIMARY KEY, btree (id)