Script not working

I have modified a plugin I wrote with an ajax call. It was working in an old Wordpress version but not in the 4.3.1.

This is my code

$error = false;
foreach($domande as $domanda) {
    if (!isset($risposte[$domanda->ID])) {
        $error = true;
        $ret['error']['missingAnswer'][] = sprintf("Manca risposta alla domanda %s", $_REQUEST['ixd'][$domanda->ID]);

                continue;
            }
            $test->addEsitoCarriera($domanda->Carriera_val*$risposte[$domanda->ID]);
            $test->addEsitoAutonomia($domanda->Autonomia_val*$risposte[$domanda->ID]);
            $test->addEsitoComodita($domanda->Comodita_val*$risposte[$domanda->ID]);
            $test->addEsitoCrescita($domanda->Crescita_val*$risposte[$domanda->ID]);
            $test->addEsitoSicurezza($domanda->Sicurezza_val*$risposte[$domanda->ID]);
        }

Only the 'missingAnswer' part is not working. What I'm doing wrong? Thanks.

via Chebli Mohamed