FAILED tests/test_pay.py::test_fetchinvoice_recurrence - jsonschema.exceptions.ValidationError: '1minutes' is not of type 'object'

Failed validating 'type' in schema['properties']['recurrence']:
    {'properties': {'period': {'description': 'the positive number which '
                                              'the time unit refers to',
                               'type': 'u32'},
                    'time_unit': {'description': 'a positive number '
                                                 'referring to a time unit '
                                                 '- 0 (seconds), 1 (days), '
                                                 '2 (months), 3 (years)',
                                  'type': 'u32'},
                    'time_unit_name': {'description': 'the name of the '
                                                      'specified time unit '
                                                      '- either  '
                                                      '"seconds", '
                                                      '"minutes", "hours", '
                                                      '"days", "weeks" or '
                                                      '"years"',
                                       'type': 'string'}},
     'required': ['time_unit', 'period'],
     'type': 'object'}

On instance['recurrence']:
    '1minutes'