Passwort geschützter Bereich im Shop - Error Meldung

Error/warning occurred. No. = 8 (E_NOTICE), msg = session_start(): A session had already been started - ignoring, file = phar:///mnt/web503/b2/79/52576479/htdocs/medialehighschool/assets/php/shop/zpshop.phar/core/general/SessionHelper.inc.php, line = 20, is warning = 1. 1) /mnt/web503/b2/79/52576479/htdocs/medialehighschool/seminare-fuer-fortgeschrittene-paul-meeks-mediale-high-school.php(502): require_once('/mnt/web503/b2/...') 2) /mnt/web503/b2/79/52576479/htdocs/medialehighschool/assets/php/shop/afx.inc.php(13): require_once('/mnt/web503/b2/...') 3) /mnt/web503/b2/79/52576479/htdocs/medialehighschool/assets/php/shop/zpshop.phar(9): include('phar:///mnt/web...') 4) phar:///mnt/web503/b2/79/52576479/htdocs/medialehighschool/assets/php/shop/zpshop.phar/core/stubs/index.php(5): require_once('phar:///mnt/web...') 5) phar:///mnt/web503/b2/79/52576479/htdocs/medialehighschool/assets/php/shop/zpshop.phar/afx.core.inc.php(375): Log::WantCleanupLogFiles() 6) phar:///mnt/web503/b2/79/52576479/htdocs/medialehighschool/assets/php/shop/zpshop.phar/core/general/LoggingHelper.inc.php(24): SessionHelper->__construct() 7) phar:///mnt/web503/b2/79/52576479/htdocs/medialehighschool/assets/php/shop/zpshop.phar/core/general/SessionHelper.inc.php(20): session_start() 8) [internal function]: zps_error_handler() Not throwing, because it is a warning. Returning TRUE from error handler to stop forwarding warning to calling code

<?php foreach ($basketPositions as $position) { ?>
        <tr>
            <td><?= $position->Quantity ?></td>
            <td><?= $position->ArticleOrVariantArticleNumber ?>: <?= $position->ArticleName ?><br /><?= $position->ArticleVariantInfo ?></td>
            <td class="price"><?= CurrencyHelper::FormatMoney($position->Price) ?></td>
            <td class="price"><?= CurrencyHelper::FormatMoney($position->TotalPrice) ?></td>
        </tr>