error while upgrading from 0.3.18r0 to 0.4.0

Hi,

running
$ psql < sql/maintenance/upgrade_0.3.18_0.4.0.sql
bails out with the following message:

FEHLER:  doppelter Schlüsselwert verletzt Unique-Constraint
»permission_pkey«
CONTEXT:  SQL-Anweisung »INSERT INTO
log.permission(log_transaction_id,log_operation,permission,rank) SELECT
currval('base.log_transaction_log_transaction_id_seq'), 'D',  $1 , $2 «

What can be done to make the upgrade work?

With kind regards,

Rob