CreateBranch "branch already exists" error is returned as 500

[itaiad200]

Trace from airflow:

021-05-06 07:34:25,512] {create_branch_operator.py:45} INFO - Create lakeFS branch 'airflow-created-branch' in repo 'repo1' from source 'main'
[2021-05-06 07:34:26,229] {taskinstance.py:1457} ERROR - Task failed with exception
Traceback (most recent call last):
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_provider/hooks/lakefs_hook.py", line 43, in create_branch
source=source_branch))
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_client/api_client.py", line 772, in call
return self.callable(self, *args, **kwargs)
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_client/api/branches_api.py", line 113, in __create_branch
return self.call_with_http_info(**kwargs)
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_client/api_client.py", line 850, in call_with_http_info
collection_formats=params['collection_format'])
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_client/api_client.py", line 415, in call_api
_check_type)
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_client/api_client.py", line 203, in __call_api
raise e
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_client/api_client.py", line 200, in __call_api
_request_timeout=_request_timeout)
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_client/api_client.py", line 461, in request
body=body)
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_client/rest.py", line 273, in POST
body=body)
File "/home/astro/.local/lib/python3.7/site-packages/lakefs_client/rest.py", line 224, in request
raise ServiceException(http_resp=r)
lakefs_client.exceptions.ServiceException: (500)
Reason: Internal Server Error
HTTP response headers: HTTPHeaderDict({'Date': 'Thu, 06 May 2021 07:34:25 GMT', 'Content-Type': 'application/json', 'Content-Length': '69', 'Connection': 'keep-alive', 'X-Request-Id': '1989b450-9510-4b00-a348-96d5fe99ca2a'})
HTTP response body: {"message":"branch 'airflow-created-branch': branch already exists"}