minor BUG: Cannot disable the default Robot

[cencio91]

Hi,

when I try to disable the default robot (the one we find after cerberus installation), I get the error:
An unexpected problem occurred. com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Column 'lbexemethod' cannot be null

my cerberus version is Cerberus4.18-1783 Build 20240501-122549 and I'm using Mysql 8.0 by a docker compose file.

Thank you very much for your great work