"error": "array_merge(): Expected parameter 1 to be an array, null given"

This is a very common point of confusion when starting with Laravel's powerful features like Observers, Events, and Broadcasting. The issue you are facing isn't necessarily a bug in your code syntax itself, but rather a misunderstanding of **how events should be triggered and how broadcasting mechanisms integrate with them.** Based on the context you provided—using an Observer to trigger a broadcast—we can diagnose the problem and establish the correct Laravel pattern. Here is a thorough developer explanation addressing your setup, best practices, and why commenting out `broadcast(new OrderStatus($order));` changes the behavior. *** # Understanding Observers, Events, and Broadcasting in Laravel When working with complex application logic in Laravel, separating concerns into Models, Observers, and Events is a fundamental best practice. Your setup involves three key components: an Eloquent Model (`Order`), an Observer (`OrderStatusObserver`), and an Event (`OrderStatus`). The interaction between these pieces determines how data flows through your application. ## The Role of the Observer An **Observer** is designed to react to specific events that happen on a Model. In your case, the `OrderStatusObserver` correctly hooks into the `created` event of the `Order` model. ```php // app/Observers/OrderStatusObserver.php public function created(Order $order) { broadcast(new OrderStatus($order)); // <--- The point of confusion } ``` The Observer's job is to detect the change and signal that something important has happened. ## Why `broadcast()` Might Be Failing The behavior you described—where commenting out the line makes it "work fine"—strongly suggests that the issue