>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3406342. --> Reported by: [pookmish](https://www.drupal.org/user/3059577) >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>When using PHP 8.2 and the latest version of league/csv, an error is thrown due to the array structure of the header.</p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <p>Enable php 8.2<br> create a simple csv with a header row and a single record<br> Attempt to import<br> Observe the error in the database logs like:<br> <code>League\Csv\SyntaxError: The header mapper indexes should only contain positive integer or 0. in League\Csv\Reader-&gt;computeHeader() (line 448 of vendor/league/csv/src/Reader.php).</code></p> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Check for the header first</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <h3 id="summary-ui-changes">User interface changes</h3> <h3 id="summary-api-changes">API changes</h3> <h3 id="summary-data-model-changes">Data model changes</h3>