return civicrm_api3_create_success([
'id' => $mailingID,
'contact_id' => $contactID,
- 'subject' => $mime->headers()['Subject'],
+ 'subject' => CRM_Utils_Array::value('Subject', $mime->headers(), ''),
'body_html' => $mime->getHTMLBody(),
'body_text' => $mime->getTXTBody(),
]);