Error: Can not deserialize procedure object

[2021-09-30T05:12:01.866Z] | prozorro_sale.procedure.errors | ERROR - Unknown error caught in API - Can not deserialize procedure with id 60c20d1c3c0c97899386fca3. 'sellingEntity' | PROCEDURE-ID: 60c20d1c3c0c97899386fca3 | X-Request-ID: 9b1a3962-5a18-46e7-89a9-b94c072189dd
Traceback (most recent call last):
  File "/procedure/prozorro_sale/procedure/db.py", line 112, in _create_procedure_obj
    data = _migrate(data)
  File "/procedure/prozorro_sale/procedure/migration.py", line 39, in _migrate
    data = migration.apply(data)
  File "/procedure/prozorro_sale/procedure/migrations/057_selling_entity_region_validation.py", line 12, in apply
    if data['sellingEntity']['address']['countryName']['uk_UA'].lower() == 'україна':
KeyError: 'sellingEntity'