[SOAP] Soap call from php help

How to corectly define parameters in call function using PHP that i get this
soap request:
    <soap:Body>
    <GetProductList xmlns="http://schemas.acme.eu/">
      <GetProductListRequest>
        <Filters>
          <Filter>
            <Name>Language</Name>
            <Value>lt-LT</Value>
          </Filter>
          <Filter>
            <Name>Currency</Name>
            <Value>LTL</Value>
          </Filter>
        </Filters>
      </GetProductListRequest>
    </GetProductList>
  </soap:Body>

I defined this way: $par= array('Filter' => array('Name' => 'Language',
'Value' => 'lt-lt'), 'Filter' => array('Name' => 'Currency', 'Value' =>
'LTL'))); and get error: System.NullReferenceException: Object reference not
set to an instance of an object

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