Throw an exception. In PHP we would throw LogicException on these cases, it should never happen thus it something wrong with your code (logic). https://www.ph

Throw an exception. In PHP we would throw LogicException on these cases, it should never happen thus it something wrong with your code (logic). https://www.php.net/manual/en/class.logicexception.php https://www.php.net/manual/en/class.logicexception.php Then in your outmost function , like the main function, you capture it and report it with a error reporting tool like Sentry (so you are aware of it and can fix it). And for the end user you would show a modal or similar to describe the error in user friendly way.