can't add an item

Hi,
on one of my site, i cna't add any item of any kindUne erreur est survenue

0 preg_match_all(): Argument #2 ($subject) must be of type string, array given

Call stack#FunctionLocation1()JROOT/libraries/src/Filter/InputFilter.php:1512preg_match_all()JROOT/libraries/src/Filter/InputFilter.php:1513Joomla\CMS\Filter\InputFilter->emailToPunycode()JROOT/libraries/src/Component/ComponentHelper.php:1274Joomla\CMS\Component\ComponentHelper::filterText()JROOT/libraries/src/Form/FormField.php:11285Joomla\CMS\Form\FormField->filter()JROOT/libraries/src/Form/Form.php:11496Joomla\CMS\Form\Form->filter()JROOT/libraries/src/MVC/Model/FormModel.php:2187Joomla\CMS\MVC\Model\FormModel->validate()JROOT/administrator/components/com_flexicontent/models/base/base.php:8158FCModelAdmin->validate()JROOT/administrator/components/com_flexicontent/controllers/items.php:5649FlexicontentControllerItems->save()JROOT/libraries/src/MVC/Controller/BaseController.php:73510Joomla\CMS\MVC\Controller\BaseController->execute()JROOT/administrator/components/com_flexicontent/admin.flexicontent.php:26411require_once()JROOT/administrator/components/com_flexicontent/flexicontent.php:2212require_once()JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:6913Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}()JROOT/libraries/src/Dispatcher/LegacyComponentDispatcher.php:7114Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch()JROOT/libraries/src/Component/ComponentHelper.php:38915Joomla\CMS\Component\ComponentHelper::renderComponent()JROOT/libraries/src/Application/AdministratorApplication.php:14316Joomla\CMS\Application\AdministratorApplication->dispatch()JROOT/libraries/src/Application/AdministratorApplication.php:18617Joomla\CMS\Application\AdministratorApplication->doExecute()JROOT/libraries/src/Application/CMSApplication.php:27818Joomla\CMS\Application\CMSApplication->execute()JROOT/administrator/includes/app.php:6319require_once()JROOT/administrator/index.php:32 

hello please take more informztion
joomla version
flexi version
in front in back ?

tried with 4.02 and with the last git version 4.11 ; back and front, j4

Can you send me an access ?