Very strange issue here- I can't create a user with the email address with the FQDN "bestworth.com." Any other users seem to be fine. Any ideas? It kills the email fetcher as well as the web UI.
When I create the user in the UI, OSTicket just hangs like this:

Apache error log:
[Sat Oct 29 02:39:45.582503 2022] [php:error] [pid 27551] [client [me]:61765] PHP Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, bool given in /var/www/[mydomain]/include/class.validator.php:188\nStack trace:\n#0 /var/www/[mydomain]/include/class.validator.php(202): Validator::is_email()\n#1 /var/www/[mydomain]/include/class.forms.php(1566): Validator::is_valid_email()\n#2 /var/www/[mydomain]/include/class.forms.php(704): TextboxField->validateEntry()\n#3 /var/www/[mydomain]/include/class.forms.php(164): FormField->getClean()\n#4 /var/www/[mydomain]/include/class.forms.php(137): Form->getClean()\n#5 /var/www/[mydomain]/include/class.user.php(276): Form->isValid()\n#6 /var/www/[mydomain]/include/ajax.users.php(305): User::fromForm()\n#7 /var/www/[mydomain]/include/class.dispatcher.php(151): UsersAjaxAPI::addUser()\n#8 /var/www/[mydomain]/include/class.dispatcher.php(38): UrlMatcher->dispatch()\n#9 /var/www/[mydomain]/include/class.dispatcher.php(120): Dispatcher->resolve()\n#10 /var/www/[mydomain]/include/class.dispatcher.php(38): UrlMatcher->dispatch()\n#11 /var/www/[mydomain]/scp/ajax.php(326): Dispatcher->resolve()\n#12 {main}\n thrown in /var/www/[mydomain]/include/class.validator.php on line 188, referer: https://[mydomain]/scp/tickets.php?a=open&uid=12609
My install info:
