understrap/sticky.php

<?php while (have_posts()) : the_post(); ?>
   <?php if (!is_sticky()) continue; ?>
<!-- ******************* The Sticky Area ******************* -->
<div class="wrapper" id="wrapper-sticky">
    <div class="container">
        <div class="col-md-12">
             <?php
            $sticky = get_option( 'sticky_posts' );
                $args = array(
                    'posts_per_page' => 1,
                    'post__in'  => $sticky,
                    'ignore_sticky_posts' => 1
                );
                $query = new WP_Query( $args );
                if ( isset($sticky[0]) ) {
                      get_template_part( 'content', get_post_format() );
                }
                wp_reset_query();
            ?>
        </div>
    </div>
</div>
<?php endwhile; ?>