I use your api to pull a stock quote every few seconds. I had it all working yesterday and this morning I loaded up my test site and got the error in the title. The code i'm using is this:
require_once('../vendor/autoload.php');
require('functions.php');
$config = Finnhub\Configuration::getDefaultConfiguration()->setApiKey('token', 'my api key');
$client = new Finnhub\Api\DefaultApi(new GuzzleHttp\Client(), $config);
$q = $_REQUEST['q'];
echo formatUSD($client->quote($q)->getc());
The formatUSD is just a little function I made to display it as money. I did also try without that function just to make sure it wasn't causing an error somehow.
The rest of the error references lines 9698 and 9674 in DefaultApi.php.