allOf not handled in Items

[TOTOleHero]

Hello,

I need to define property UnitGameSystem.profiles with an array of multiple type of object ProfileXXX whish are inherited of object Profile

...
  UnitGameSystem:
    properties:
      id:
        type: string
      name:
        type: string
      profiles:
        items:
          allOf:
            - $ref: '#/definitions/ProfileAOS4'
            - $ref: '#/definitions/ProfileWFB9'
            - $ref: '#/definitions/ProfileWFB12'
            - $ref: '#/definitions/ProfileWHQ'
            - $ref: '#/definitions/ProfileT9A12'
        type: array
...

I have an error for this definition

d:\PROJECTS\swagger_to_uml>python swagger_to_uml.py fantasy-battle-db.swagger.json > fantasy-battle-db.puml
Traceback (most recent call last):
  File "d:\PROJECTS\swagger_to_uml\swagger_to_uml.py", line 380, in <module>
    sw = Swagger.from_file(input_file_name)
  File "d:\PROJECTS\swagger_to_uml\swagger_to_uml.py", line 367, in from_file
    return Swagger.from_dict(loader(fd))
  File "d:\PROJECTS\swagger_to_uml\swagger_to_uml.py", line 356, in from_dict
    definitions = [Definition.from_dict(name, definition) for name, definition in d.get('definitions',{}).items()]
  File "d:\PROJECTS\swagger_to_uml\swagger_to_uml.py", line 356, in <listcomp>
    definitions = [Definition.from_dict(name, definition) for name, definition in d.get('definitions',{}).items()]
  File "d:\PROJECTS\swagger_to_uml\swagger_to_uml.py", line 193, in from_dict
    properties.append(Property.from_dict(
  File "d:\PROJECTS\swagger_to_uml\swagger_to_uml.py", line 102, in from_dict
    items = resolve_ref(type_dict['items']['$ref'])
KeyError: '$ref'

full json is : fantasy-battle-db.swagger.json.txt

Thank's you