Error creating multi select custom field

Hi to all,

My Env:
Suitecrm: 12.6
PHP 7.4
MySQL 8
Ubuntu 20.04

Brand new installation of suitecrm.

When I am trying to create a new custom field in any module (account, contact)
and when I select multi select, I get the following error:

An error has occurred

Notice: Trying to access array offset on value of type null in /var/www/html/modules/DynamicFields/templates/Fields/Forms/multienum.php on line 49
{“east”:{“title”:“Edit Field”,“crumb”:"",“content”:"

</div>\n\n

Thanks in advance for any help

Can you check if php.ini has error_display set to ON ? if that is on, set it to Off.

Thank you, I have made error_reporting=E_ERROR in php.ini and the notice (while exist) is not showing.