try to fix SonarQube bug - A "NullPointerException" could be thrown

I am facing one strange Sonar issue - A "NullPointerException" could be thrown.

Below is my service implementation class. emailNotificationServiceClient is FeignClient Interface which works fine.

      try {        // send POST request        ResponseEntity<GenericRes<?>> response = emailNotificationServiceClient.sendEmail(payload);        // check response        if (response != null) {            if (response.getStatusCode() == HttpStatus.OK)                log.info("Email Send Successful : {}", response.getBody());            else                log.info("Email Send Failed : {}", response.getBody());            if (response.getBody() != null && response.getBody().getMessage() != null && !response.getBody().getMessage().isEmpty())                return CompletableFuture.completedFuture(response.getBody().getMessage());        }    } catch (Exception e) {        log.error("Error while sending email - sendEmailNotification in esb", e);        return CompletableFuture.completedFuture(e.getMessage());    }

GenericRes class -

@Data@Builder@AllArgsConstructor@NoArgsConstructorpublic class GenericRes<T> {    private String message;    private T data;}

I know that I have to add null check for object and then I should use that object. I have tried that but it won't work.

I have also tried Java 8 Optional.ofNullable but still facing same problem.