PDOException: SQLSTATE[23505]: Unique violation: 7 ERROR: duplicate key value violates unique constraint

Drupal with PostgresSQL cloning an entity created using ECK.

<?php
replicate_entity_by_id('daas_site', 1);
?>

WD daas_site: PDOException: SQLSTATE[23505]: Unique violation: 7 ERROR:  duplicate key value violates unique constraint "eck_daas_site_pkey"                                                                                                                                                             [error]
DETAIL:  Key (id)=(1) already exists.: INSERT INTO eck_daas_site

Here is a small diff that fixes this:

diff --git a/sites/all/modules/contrib/replicate/replicate.module b/sites/all/modules/contrib/replicate/replicate.module
index 53c6c25..a4563df 100755
--- a/sites/all/modules/contrib/replicate/replicate.module
+++ b/sites/all/modules/contrib/replicate/replicate.module
@@ -102,6 +102,9 @@ function replicate_clone_entity($entity_type, $entity) {
     drupal_alter('replicate_entity', $clone, $entity_type, $entity);
   }
 
+  $entity_info = entity_get_info($entity_type);
+  unset($clone->{$entity_info['entity keys']['id']});
+
   return $clone;
 }

Also, in the mean time a work around (currently untested) would be to add the same unsetting of the clone's id in HOOK_replicate_entity_alter()