Undefined index : SEARCH_QUERY_PERFORMANCE_REPORT

Hi All, 

Am getting a type error for the following script- can you please advise on why I am getting a type error. Display Report works fine, but Search Report doesn't. Thanks in advance.

ERROR: Undefined index: type in /home/maurice/www/hc/vendor/googleads/googleads-php-lib/src/Google/Api/Ads/AdWords/Util/XmlDeserializer.php on line 136

CODE:

   //Download Search Query Performance Report

            $this->user->LoadService('ReportDefinitionService', $this->adwords_version);

            $unique_id = uniqid();

            $reportDefinition = new ReportDefinition();

            $reportDefinition->reportName = 'Search Query Performance Report #' . $unique_id;

           // $reportDefinition->dateRangeType = 'CUSTOM_DATE';

            $reportDefinition->reportType = 'SEARCH_QUERY_PERFORMANCE_REPORT';

            $reportDefinition->downloadFormat = 'XML';

            $selector = new Selector();

            $selector->fields = array(

                    'AdGroupId',

                    'AdGroupName',

                    'Impressions',

                    'Clicks',

                    'Ctr'

            );

            $startDate = date("Ymd", strtotime("-31 days"));

            $endDate = date("Ymd", strtotime("-1 days"));

            $selector->dateRange = new DateRange($startDate, $endDate);

            $selector->predicates[] = new Predicate('Status', 'EQUALS', array('ENABLED'));

            $selector->predicates[] = new Predicate('AdGroupId', 'IN', array_keys($this->active_adGroups));

            $reportDefinition->selector = $selector;

            $fileName = 'search.xml';

            $path = $this->directory . $fileName;

            $options = array('version' => $this->adwords_version);

            //$result = ReportUtils::DownloadReport($reportDefinition, $path, $this->user, $options

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