A crash when ippDelete(request) or ippDelete(response) is called #1349

ipp_t *request = NULL;
 ipp_t *response = NULL;
 http_status_t result;
 request = ippNewRequest(op);
 ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_URI, "printer-uri", NULL, printer_uri);
 ippAddStrings(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD, "requested-attributes",
         sizeof(pattrs) / sizeof(pattrs[0]), NULL, pattrs);

 do {
     result = cupsSendRequest(http, request, resource, ippLength(request));
     if (result <= HTTP_STATUS_CONTINUE || result == HTTP_STATUS_OK) {
         response = cupsGetResponse(http, resource);
         result = httpGetStatus(http);
     }

     if (result == HTTP_STATUS_ERROR ||  (result >= HTTP_STATUS_BAD_REQUEST && 
         result != HTTP_STATUS_UNAUTHORIZED && result != HTTP_STATUS_UPGRADE_REQUIRED)) {
         _cupsSetHTTPError(result);
         break;
     }

     if (http->state != HTTP_STATE_WAITING) {
         httpFlush(http);
     }
 } while (response == NULL);
 
 if (response  && (attrptr = ippFindAttribute(response, "printer-state", IPP_TAG_ENUM)) != NULL) {
      printer_ippstate = (ipp_pstate_t) ippGetInteger(attrptr, 0);
 }

 ippDelete(request);
 ippDelete(response);