# RetrieX Vocabulary Hotfix

This patch fixes a runtime error introduced by the vocabulary centralization patch.

## Fixed error

`array_key_exists(): Argument #2 ($array) must be of type array, App\Config\DomainVocabularyConfig given`

## Root cause

`NdjsonHybridRetrieverConfig::raw()` still checked `$this->vocabulary` as if it were an array. After the vocabulary refactor, `$this->vocabulary` is a `DomainVocabularyConfig` object. Effective vocabulary fallback is already resolved before `raw()` is called, so this second `array_key_exists()` check was invalid and unnecessary.

## Changed file

- `src/Config/NdjsonHybridRetrieverConfig.php`

## After applying

Clear Symfony cache before testing.