BerriAI/litellm · error · ValueError

Invalid webhook url value for: {webhook_urls}. Got type={typ

Error message

Invalid webhook url value for: {webhook_urls}. Got type={type(_env_value)}

What it means

Error "Invalid webhook url value for: {webhook_urls}. Got type={type(_env_value)}" thrown in BerriAI/litellm.

Source

Thrown at litellm/integrations/SlackAlerting/utils.py:48

    for alert_type, webhook_urls in alert_to_webhook_url.items():
        if isinstance(webhook_urls, list):
            _webhook_values: list[str] = []
            for webhook_url in webhook_urls:
                if "os.environ/" in webhook_url:
                    _env_value = get_secret(secret_name=webhook_url)
                    if not isinstance(_env_value, str):
                        raise ValueError(f"Invalid webhook url value for: {webhook_url}. Got type={type(_env_value)}")
                    _webhook_values.append(_env_value)
                else:
                    _webhook_values.append(webhook_url)

            alert_to_webhook_url[alert_type] = _webhook_values
        else:
            _webhook_value_str: str = webhook_urls
            if "os.environ/" in webhook_urls:
                _env_value = get_secret(secret_name=webhook_urls)
                if not isinstance(_env_value, str):
                    raise ValueError(f"Invalid webhook url value for: {webhook_urls}. Got type={type(_env_value)}")
                _webhook_value_str = _env_value
            else:
                _webhook_value_str = webhook_urls

            alert_to_webhook_url[alert_type] = _webhook_value_str

    return alert_to_webhook_url


async def _add_langfuse_trace_id_to_alert(
    request_data: dict | None = None,
) -> str | None:
    """
    Returns langfuse trace url

    - check:
    -> existing_trace_id
    -> trace_id

View on GitHub (pinned to 6c2dcb801b)

Solutions

1. Set the webhook URLs value to a string or list of strings.

When it happens

Trigger: Thrown at litellm/integrations/SlackAlerting/utils.py:48 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@6c2dcb801b (2026-08-15). Data as JSON: /api/errors/6f1e4bcec05f6184. Report an issue: GitHub.