code: public static void checkNullTypedParams(String url, ApiRequestParams params) {
      if (params == null) {
        throw new IllegalArgumentException(String.format("Found null params for %s. "
            + "Please pass empty params using param builder via `builder().build()` instead.", url
        ));
      }
    }
docs: Invalidate null typed parameters.
  @param url     request url associated with the given parameters.
  @param params  typed parameters to check for null value.