Returned more than one IssueCategory

Hi, how can I deal with this problem?

(venv) bitnami@PRODV-MBRM01:/home/bitnami/redmine-migration/redmine$ python clone_issues.py --create-users smartney bug smartney bug Issues: 0%| | 0/7702 [00:00<?, ?it/s] Traceback (most recent call last): File "clone_issues.py", line 13, in <module> RedmineMigration(sys.argv[1:]) File "/home/bitnami/redmine-migration/redmine/migration.py", line 30, in __init__ self.handle(None, **vars(self.parser.parse_args(argv))) File "/usr/lib/python3.7/contextlib.py", line 74, in inner return func(*args, **kwds) File "/home/bitnami/redmine-migration/redmine/migration.py", line 323, in handle self.handle_issue(issue) File "/home/bitnami/redmine-migration/redmine/migration.py", line 67, in handle_issue issue.category = self.must_get(IssueCategory, 'name', issue.category.name) File "/home/bitnami/redmine-migration/redmine/migration.py", line 270, in must_get return model.objects.using(database).get(**{field_name: field_value}) File "/home/bitnami/redmine-migration/venv/lib/python3.7/site-packages/django/db/models/query.py", line 436, in get num if not limit or num < limit else 'more than %s' % (limit - 1), redmine_models.models.MultipleObjectsReturned: get() returned more than one IssueCategory -- it returned 2! (