The blacklist system seems to have broken the ability for clients to open tickets. To reproduce, on 5.9.0:
1. Create a support department
2. Login as a client and click to open a ticket, fill out the form and submit
A 500 error occurs, and the following is written to the logs:
[2024-01-17T18:39:51.593590+00:00] general.ERROR: Uncaught Exception TypeError: "Argument 1 passed to Blacklist::verify() must be of the type string, null given, called in /home/user/public_html/plugins/support_manager/controllers/client_tickets.php on line 234" at /home/user/public_html/app/models/blacklist.php line 255
{"exception":"[object] (TypeError(code: 0): Argument 1 passed to Blacklist::verify() must be of the type string, null given, called in /home/user/public_html/plugins/support_manager/controllers/client_tickets.php on line 234 at /home/user/public_html/590/app/models/blacklist.php:255)"}