Error i found in logs, can someone help please?

Ive been getting this error in my logs, does it every second

A non-numeric value encountered at /3rdparty/phpseclib/phpseclib/phpseclib/bootstrap.php nextcloud

this is the output of bootstrap.php

<?php /** * Bootstrapping File for phpseclib * * @license http://www.opensource.org/licenses/mit-license.html MIT License */ if (extension_loaded('mbstring')) { // 2 - MB_OVERLOAD_STRING if (ini_get('mbstring.func_overload') & 2) { throw new \UnexpectedValueException( 'Overloading of string functions using mbstring.func_overload ' . 'is not supported by phpseclib.' ); } } running debian 11 nextcloud version 23.0.2