> This page is for Fern CLI.

> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt.

## 3.4.2

**`(fix):`** Fix `fern generate` crash when inheriting from a schema with top-level `nullable: true` via `allOf`. The OpenAPI importer now correctly strips nullable wrappers from type references in extends lists.