TypeError: strlen(): Argument #1 ($string) must be of type string, array given in strlen() (line 401 of core/lib/Drupal/Component/Utility/Unicode.php).
strlen() (Line: 401)
Drupal\Component\Utility\Unicode::validateUtf8() (Line: 144)
Drupal\Component\Utility\Xss::filter() (Line: 202)
Drupal\Component\Utility\Xss::filterAdmin() (Line: 129)
Drupal\Core\Ajax\MessageCommand->render() (Line: 43)
Drupal\Core\Ajax\AjaxResponse->addCommand() (Line: 549)
Drupal\big_pipe\Render\BigPipe->sendPlaceholders() (Line: 257)
Drupal\big_pipe\Render\BigPipe->sendContent() (Line: 116)
Drupal\big_pipe\Render\BigPipeResponse->sendContent() (Line: 403)
Symfony\Component\HttpFoundation\Response->send() (Line: 36)
Symfony\Component\Runtime\Runner\Symfony\HttpKernelRunner->run() (Line: 32)
require() (Line: 22)
require_once() (Line: 13)