How to Ignore or Check "SOAP-ERROR: Encoding: Violation of Encoding Rules" in PHP

Hello i am making a soap call in my php application

$options = array(
    'soap_version' => SOAP_1_1,
    'exceptions' => true,
    'trace' => 1,
    'cache_wsdl' => WSDL_CACHE_NONE,
    'local_cert' => 'my.key',
);
$client = new SoapClient('http://domain.com/my.wsdl', $options);
var_dump($client->functionName($args));

      

        
        
        
      

    

which results in an exception

SOAP-ERROR: Encoding: Violation of encoding rules

      

        
        
        
      

    

I think the problem is with server-respnse, because

$client->__getLastResponse()

      

        
        
        
      

    

contains a nice server answer, as per other questions, there is probably a value type mismatch.

Is it possible to find out what value is causing this error, or is it possible to disable this check?