jasper reports – Error when trying to contact api for PDF File Generation from PHP-ThrowExceptions

I got a 500 error response from server while trying to contact an api via a PHP source code:

Code HTTP = 500. net.sf.jasperreports.engine.fill.JRExpressionEvalException: Error evaluating expression for source text: ($F{urlMediaGnx} != null && $F{urlMediaGnx} != "") ? Utils.getBufferedImage($F{urlMediaGnx}) : null

Here is the PHP source code for the function that call the API:

function callApiMedia ($codeProduit)
{
    $retour = false;

    if (!empty($codeProduit)) {
        $url = "/medias/$codeProduit?allMedias=false&size=small";

        $context = strtoupper(common::pref("context"));
        if (!empty($context)) {
            $baseUrl = getServerBaseUrl($context);
            if (!empty($baseUrl)) {
                $url = $baseUrl.$url;

                // entêtes HTTP
                $headers = [
                        'Content-type: text/plain',
                        'charset=UTF-8'
                ];

                $ch = curl_init();

                http_build_query($url);
                curl_setopt($curl, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
                curl_setopt($ch, CURLOPT_URL, $url);
                curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
                curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

                // appel au webservice
                $r = curl_exec($ch);

                $result = array();
                $result['httpCode'] = curl_getinfo($ch, CURLINFO_HTTP_CODE);
                $result['body'] = $r;

                curl_close($ch);

                return $result;
            }
        }
    }

    return $retour;
}

Here is the main PHP source code.

Please Help.

            $bookingDetailBeans = array();
            foreach ($sqlBookingDetailResultSet as $sqlBookingDetailResult) {

                $response = callApiMedia($sqlBookingDetailResult['CODPRO']);
                $urlMediaGnx = "";
                if ($response && $response['httpCode'] == 200) {
                    $response = json_decode($response['body']);
                    $urlMediaGnx = $response->medias;
                    $urlMediaGnx = ((object)$urlMediaGnx[0]);
                    $urlMediaGnx = $urlMediaGnx->secureUrl;
                }

                $bookingDetailBeans[] = array(
                    "codPro" => $sqlBookingDetailResult['CODPRO'],
                    "nomPro" => $sqlBookingDetailResult['NOMPRO'],
                    "qteCde" => $sqlBookingDetailResult['QTE_CDE'],
                    "nomencDoua" => $sqlBookingDetailResult['NOMENC_DOUA'],
                    "urlMediaGnx" => $urlMediaGnx,
                    "compo" => $sqlBookingDetailResult['COMPO']
                );
            }