diff --git a/app/Http/Controllers/Api/UserAssignedTicketController.php b/app/Http/Controllers/Api/UserAssignedTicketController.php
index c750955..712b584 100644
--- a/app/Http/Controllers/Api/UserAssignedTicketController.php
+++ b/app/Http/Controllers/Api/UserAssignedTicketController.php
@@ -17,11 +17,14 @@ class UserAssignedTicketController extends ApiController
     public function __invoke(Request $request, User $user): JsonResponse
     {
         $viewer = $this->authenticatedUser($request);
+        $assignedTicketsByProject = $this->listAssignedTicketsByVisibleProject->handle($viewer, $user);
 
         return response()->json([
-            'data' => $this->listAssignedTicketsByVisibleProject->handle($viewer, $user),
+            'data' => $assignedTicketsByProject,
             'meta' => [
-                'assignee' => UserResource::make($user)->resolve(),
+                'assignee' => $assignedTicketsByProject === []
+                    ? null
+                    : UserResource::make($user)->resolve(),
             ],
         ]);
     }
diff --git a/docs/openapi/kanbangit-api.openapi.json b/docs/openapi/kanbangit-api.openapi.json
index 9a1a607..e1beb6f 100644
--- a/docs/openapi/kanbangit-api.openapi.json
+++ b/docs/openapi/kanbangit-api.openapi.json
@@ -1844,7 +1844,14 @@
             "type": "object",
             "properties": {
               "assignee": {
-                "$ref": "#/components/schemas/User"
+                "oneOf": [
+                  {
+                    "$ref": "#/components/schemas/User"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               }
             },
             "required": ["assignee"]
diff --git a/tests/Feature/Api/AssignedTicketsApiTest.php b/tests/Feature/Api/AssignedTicketsApiTest.php
index 196f39e..36fcb5a 100644
--- a/tests/Feature/Api/AssignedTicketsApiTest.php
+++ b/tests/Feature/Api/AssignedTicketsApiTest.php
@@ -77,4 +77,28 @@ class AssignedTicketsApiTest extends TestCase
             ->assertJsonCount(1, 'data.1.tickets')
             ->assertJsonCount(2, 'data');
     }
+
+    public function test_assignee_metadata_is_hidden_when_no_visible_assigned_tickets_exist(): void
+    {
+        $viewer = User::factory()->create();
+        $assignee = User::factory()->create([
+            'email' => 'assignee@example.test',
+            'name' => 'Hidden Assignee',
+        ]);
+        $hiddenProject = Project::factory()->create();
+
+        Ticket::factory()->create([
+            'assignee_user_id' => $assignee->id,
+            'project_id' => $hiddenProject->id,
+            'sequence_number' => 42,
+            'ticket_key' => 'HID-42',
+            'title' => 'Invisible assignment',
+        ]);
+
+        $this->withApplicationKey($viewer)
+            ->getJson(route('api.users.assigned-tickets', $assignee))
+            ->assertOk()
+            ->assertJsonPath('data', [])
+            ->assertJsonPath('meta.assignee', null);
+    }
 }