'TypeError: Cannot read property 'parent' of null' when linting from cli

[nulltoken]

I'm submitting a...

• bug report
• feature request

What is the current behavior?

Given a following repro/two.yaml file

swagger: '2.0'

info:
  title: Repro two
  description: Endpoint definition
  version: "1.0.0"
  contact:
    name: toto
host: not-example.com
schemes:
  - https
basePath: /repro/two

paths:
  /quotes_requests:
    post:
      summary: Gets nothing either.
      operationId: "12"
      description: Cf. summary
      tags: [yep]
      parameters:
        - name: body
          description: Content.
          in: body
          schema:
            $ref: '#/definitions/AnotherDefinition'
      responses:
        204:
          description: Zip

definitions:
  AnotherDefinition:
    type: object
    properties:
      special:
        description:

linting from the cli returns a error.

$ yarn spectral lint ./repro/two.yaml
yarn run v1.15.2
$ C:\REDACTED\node_modules\.bin\spectral lint ./repro/two.yaml
linting ./repro/two.yaml
OpenAPI 2.0 (Swagger) detected
Encountered error when running rule 'oas2-schema' on node at path '$':
TypeError: Cannot read property 'parent' of null
No errors or warnings found!
Done in 1.01s.

Note: Providing a valued description in the very last node makes the issue disappear.

What is the expected behavior?

Either:

• Remove the error message if it's not supposed to happen
• Provide a more user-friendly/actionable error message (if another error is blocked from popping up by this one)

What is the motivation / use case for changing the behavior?

N/A

Please tell us about your environment:

• Version: @stoplight/spectral/2.0.6
• Framework: win32-x64 node-v10.14.2
• Language: all

[nulltoken]

@P0lip ❤️

[P0lip]

Released in 2.1.1