500 error on attempt to complete procedure with wrong award statuses

>       with pytest.raises(ApiException) as api_exp:
E       assert 500 == 403
E         -500
E         +403

test_scenarios/test_procedure.py:1602: AssertionError
------------------------------------------------------------------------------------------------------------- Captured log call --------------------------------------------------------------------------------------------------------------
ERROR    service_errors:conftest.py:41 Got unexpected api error.
Endpoint: ('POST', 'https://procedure-dev.prozorro.sale/api/procedures/5e344240f2a09f20565c26fd/complete').
Details: {"message": "Internal server error"}