Added in include/PullRequest/Dao.php :

```
public function searchOpenByReferences($repo_src_id, $sha1_src, $repo_dest_id, $sha1_dest)
    {
        $sql = 'SELECT *
                FROM plugin_pullrequest_review
                WHERE repository_id = ?
                  AND sha1_src = ?
                  AND repo_dest_id = ?
                  AND sha1_dest = ?
                  AND status = ?';

        return $this->getDB()->row($sql, $repo_src_id, $sha1_src, $repo_dest_id, $sha1_dest, 'R');
    }
```

Added in include/PullRequest/PullRequestCreator.php l.150:

```
- $row = $this->pull_request_dao->searchByReferences($repo_src_id, $sha1_src, $repo_dest_id, $sha1_dest);
+ $row = $this->pull_request_dao->searchOpenByReferences($repo_src_id, $sha1_src, $repo_dest_id, $sha1_dest);
```

Seams to be working fine. Need to be done on official releases.