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Another question, this time regarding OpenAPI V3 and Swagger integration.

Whenever I use a DTO with a nullable property, even if the client and server are working perfectly fine, my Swagger docs fail to load entirely.

```Failed to load API definition.
Fetch error
Internal Server Error /api/openapi.json```
I've tried Jackson at first, and now Kotlinx serialization to handle OpenAPI v3, but neither solved the issue.

Note I Kotlinx serialization for the entire server/shared/client modules.

```val api = contract {
    renderer = OpenApi3(ApiInfo("Example", "1.0.0"), Jackson)
    descriptionPath = "/openapi.json"
    routes += exampleController.routes
}```
Is there some way to deal with this?

Have you passed an example (that isnt null) for the nullable property? in the `receiving`

This will probably be the problem. You cannot pass any null to the renderer, because it uses the JSON example in order to create the schema. :slightly_smiling_face:

Thank you both for the advice! That fixed it.