ApiException : trying to access array offset on value of type null

[brutalVinz]

Hi,
When trying to update data via API i got this error:

In ApiException.php line 29:
Trying to access array offset on value of type null

public function getResponse($key = null) { print_r($this->response); return $key ? $this->response[$key] : $this->response; }

$key value is "message" but $this->response is null