Use Gemini with n8n implementation seems to default to OpenAI

[werther777]

Hi.
I'm using crawl4ai on a local docker + endpoint exposed.
n8n is hosted.
The call to the /crawl endpoint is successful, but I receive this:

[
  {
    "status": "failed",
    "created_at": 1750755035.9841993,
    "error": "API token must be provided for LLMExtractionStrategy. Update the config.py or set OPENAI_API_KEY environment variable."
  }
]

This is the call:

{
  "urls": "https://some_url",
  "crawler_params": {
    "headless": true
  },
  "extraction_config": {
    "type": "llm",
    "params": {
      "llm_config": {
        "provider": "gemini/gemini-2.0-flash"
      },
      "schema": {
        "title": "RecipeUrlsToScrape",
        "type": "object",
        "properties": {
          "recipe_name": {
            "title": "Recipe Name",
            "description": "Name of the recipe",
            "type": "string"
          },
          "recipe_url": {
            "title": "Recipe Url",
            "description": "Recipe Url",
            "type": "string"
          }
        },
        "required": ["recipe_name", "recipe_url"]
      },
      "extraction_type": "schema",
      "instruction": "From the crawled content, extract all recipe names and url. Ensure the url is for a recipe and not any other content"
    }
  },
  "cache_mode": "bypass"
}

my docker .env contains the key:

CRAWL4AI_API_TOKEN=my_key
GEMINI_API_KEY=my_gemini_api_key
OPENAI_API_KEY=

Open API key is empty because I'm not using it. However, the implementation of /crawl seems to assume I am and it's trying to find it.

Any idea? Am I doing something wrong?