Warning: htmlspecialchars()

Warning: htmlspecialchars() expects parameter 1 to be string, array given in Drupal\Component\Utility\Html::escape() (line 424 of core/lib/Drupal/Component/Utility/Html.php).
It seems like https://www.drupal.org/project/bootstrap_barrio/issues/3122213 →

Drupal: 8.9.13 PHP:7.2,7.3

My solution
\src\RenderBuilder.php

            $link['attributes']['title'] = $this->t(
              'Current active @current language',
              //['@current' => $link_title]
              ['@current' => $link_title['#text']]
            );
            $url_options['fragment'] = '!';