#vulnerable code 
                                @Nonnull
    public KubernetesCloud getKubernetesCloud() {
        Cloud cloud = Jenkins.getInstance().getCloud(getCloudName());
        if (cloud instanceof KubernetesCloud) {
            return (KubernetesCloud) cloud;
        } else {
            throw new IllegalStateException(getClass().getName() + " can be launched only by instances of " + KubernetesCloud.class.getName());
        }
    } 
                            #location 3 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Nonnull
    public KubernetesCloud getKubernetesCloud() {
        return getKubernetesCloud(getCloudName());
    }