Query parameter content parsing error: TypeError: Cannot read properties of undefined (reading 'collectionFormat')

Q&A

• OS: Windows 10 x64
• Browser: Chrome
• Version: Version 109.0.5414.74 (Official Build) (64-bit)
• Method of installation: -
• Swagger-UI version: web
• OpenAPI version: OpenAPI 3.0.3

Content & configuration

Open https://editor.swagger.io/

To reproduce...

1. Paste relevant spec (attached below)
2. Open user agent dev tools
3. Expand the only endpoint (POST: /store/order)
4. Try it out leaving input untouched
5. Click Execute button
6. Inspect user agent console

Expected behavior

Request should be sent without console errors

Screenshots

Additional context or thoughts

This does not happen when an example is provided in conjunction with the schema object, for instance:

content:
          application/json:
            schema:
              oneOf:
                - type: integer
                  format: int64
                - type: string
                - type: object
            example: ''

I found no mentions whether example for current case is required or not in dedicated documentation section: https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.0.3.md#parameter-object-examples

open-api.yaml

openapi: 3.0.0
info:
  version: 0.0.1
  title: Swagger Petstore
paths:
  /store/order:
    parameters:
      - name: storeFilter
        description: Named storeFilter
        required: false
        in: query
        content:
          application/json:
            schema:
              oneOf:
                - type: integer
                  format: int64
                - type: string
                - type: object
    post:
      summary: Petstore page
      responses:
        '200':
          description: Petstore page
          content:
            application/json:
              schema: {}
      tags:
        - store
tags:
  - name: store
    description: Access to Petstore orders

Start with the supplied OpenAPI 3.0.0 specification in Swagger UI at editor.swagger.io, expand POST /store/order, and reproduce the error by executing the untouched query parameter. Trace the query parameter content parsing that reads collectionFormat; done means the request is sent without a console TypeError, including when the schema uses oneOf without an example.