whoops page

Hello,
i use an package from github: https://github.com/fattureincloud/fattur...ud-php-sdk
and i integrate it correctly.. 
my problem is when use it in a specefic conditions my website return the "whoops page" although i use the Exception!
my code is: 

PHP Code:

$config = FattureInCloud\Configuration::getDefaultConfiguration()->setAccessToken('tokenvalue');


 $apiInstance = new FattureInCloud\Api\ClientsApi(
 // If you want use custom http client, pass your client which implements `GuzzleHttp\ClientInterface`.
 // This is optional, `GuzzleHttp\Client` will be used as default.
 new GuzzleHttp\Client(),
 $config
 );
 $company_id = 12345678; // int | The ID of the company.

$q = 'vat_number=xxxxx'; // string | Query for filtering the results.
  
try {
    $result = $apiInstance->listClients($company_id, $fields, $fieldset, $sort, $page, $per_page, $q);
    print_r($result);
} catch (Exception $e) {
    echo 'Exception when calling ClientsApi->listClients: ', $e->getMessage(), PHP_EOL;
} 


in error log i see this: 
resulted in a `422 Unprocessable Entity` response:

{"error":{"message":"Invalid query syntax.","validation_result":null}}

My questio is:
How i change the whoops page by the error message returned?! because i not need by script stopped and must continue working with diplayong error message!
thanks..