fix(notify): protect listener against missing user

Author: ShehabMohamedGamal

app/Listeners/SendEnrollmentConfirmationEmail.php

@@ -5,6 +5,8 @@
 use App\Events\StudentEnrolled;
 use App\Notifications\EnrollmentConfirmation;
 use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Support\Facades\Log;
+use Throwable;
 
 class SendEnrollmentConfirmationEmail implements ShouldQueue
 {
@@ -22,8 +24,21 @@ class SendEnrollmentConfirmationEmail implements ShouldQueue
 
     public function handle(StudentEnrolled $event): void
     {
-        $event->enrollment->student->notify(
-            new EnrollmentConfirmation($event->enrollment)
-        );
+        $student = $event->enrollment->student;
+
+        // Guard: user may have been deleted between dispatch and processing
+        if (! $student) {
+            return;
+        }
+
+        $student->notify(new EnrollmentConfirmation($event->enrollment));
+    }
+
+    public function failed(StudentEnrolled $event, Throwable $exception): void
+    {
+        Log::error('EnrollmentConfirmation notification failed after all retries', [
+            'enrollment_id' => $event->enrollment->id,
+            'exception' => $exception->getMessage(),
+        ]);
     }
 }