You have created a template override under /templates/protostar/html/com_easysocial/toolbar/default.php and it is missing the following codes,
[gist]
<li class="<?php echo $view == 'conversations' ? 'is-active' : '';?>" data-es-logout>
<a href="javascript:void(0);" class="es-navbar__footer-link" data-es-logout-button>
<i class="fa fa-power-off"></i>
<span>
<?php echo JText::_('Logout');?>
</span>
</a>
<form class="logout-form" action="<?php echo JRoute::_('index.php');?>" data-es-logout-form method="post">
<input type="hidden" name="return" value="<?php echo $logoutReturn;?>" />
<input type="hidden" name="option" value="com_easysocial" />
<input type="hidden" name="controller" value="account" />
<input type="hidden" name="task" value="logout" />
<input type="hidden" name="view" value="" />
<?php echo $this->html('form.token'); ?>
</form>
</li>
[/gist]