Extended class triggering forbidden functions

Hello.

Since my custom filter was triggering an error ("$in requires an array"), i created a new PHP file containing a "CustomFilterApi" class that extends FilterApi class, so then i was able to change some FilterApi's functions and bypass my filter's error. But when i extend the FilterApi class, it triggers some forbidden functions.

There's my CustomFilterApi code:

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<?php
/*
 * Your installation or use of this SugarCRM file is subject to the applicable
 * terms available at
 * http://support.sugarcrm.com/Resources/Master_Subscription_Agreements/.
 * If you do not agree to all of the applicable terms or do not have the
 * authority to bind the entity as an authorized representative, then do not
 * install or use this SugarCRM file.
 *
 * Copyright (C) SugarCRM Inc. All rights reserved.
 */
require_once ("clients/base/api/FilterApi.php");
class CustomFilterApi extends FilterApi
{
    protected static function addFilters(array $filterDefs, SugarQuery_Builder_Where $where, SugarQuery $q)
    {
        foreach ($filterDefs as $filterDef) {
            if (!is_array($filterDef)) {
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

<?php

/*
 * Your installation or use of this SugarCRM file is subject to the applicable
 * terms available at
 * http://support.sugarcrm.com/Resources/Master_Subscription_Agreements/.
 * If you do not agree to all of the applicable terms or do not have the
 * authority to bind the entity as an authorized representative, then do not
 * install or use this SugarCRM file.
 *
 * Copyright (C) SugarCRM Inc. All rights reserved.
 */

require_once ("clients/base/api/FilterApi.php");

class CustomFilterApi extends FilterApi
{
	protected static function addFilters(array $filterDefs, SugarQuery_Builder_Where $where, SugarQuery $q)
    {
        foreach ($filterDefs as $filterDef) {
            if (!is_array($filterDef)) {
				$filterDef = array($filterDef);
                /*throw new SugarApiExceptionInvalidParameter(
                    sprintf(
                        'Did not recognize the definition: %s',
                        print_r($filterDef, true)
                    )
                );*/
            }
            foreach ($filterDef as $field => $filter) {
                parent::addFilter($field, $filter, $where, $q);
            }
        }
    }
}

Error screenshot:

/resized-image/__size/319x137/__key/communityserver-discussions-components-files/42/EVIDENCE1.png