mage-eventpress/templates/single/speaker-list.php

<h3><?php ?><i class="<?php echo esc_attr($speaker_icon); ?>"></i> <?php echo esc_html($speaker_label); ?></h3>
<ul>
    <?php
    foreach ($speakers_id as $speakers) {
    ?>
        <li>
            <a href='<?php echo get_the_permalink($speakers); ?>'><?php if (has_post_thumbnail($speakers)) {
                     echo get_the_post_thumbnail($speakers, 'medium');
                 } else {
                     ?>
                            <img src="<?php echo esc_url(plugins_url('../images/no-photo.jpg', __DIR__)); ?>" alt=""/>
                      <?php
                  } ?>
                <h6><?php echo get_the_title($speakers); ?></h6>
            </a>
        </li>
    <?php
    }
    ?>
</ul>