NullPointer for a response with error

[splix]

The following code in HttpClient:

JsonNode errorJson = new ObjectMapper().readTree(httpConnection.getErrorStream());
if (errorJson != null) {
      errorText = errorJson.get("error").asText();
}

fails with NullPointerException on .asText() call because the API doesn't provide such field. It only has:

{"type":"api_parsing_error","message":"...","pos":{"line":1,"column":53,"id":0,"location":"query"}}