diff --git a/app/Http/Controllers/ChartController.php b/app/Http/Controllers/ChartController.php
index d7820fc..9bf35ca 100644
--- a/app/Http/Controllers/ChartController.php
+++ b/app/Http/Controllers/ChartController.php
@@ -98,7 +98,7 @@ class ChartController extends Controller
         });
 
         return [
-            'x_axis' => array_values($weeks),
+            'x_axis' => $weeks->values(),
             'series' => $series->sortKeys()->values()->all(),
         ];
     }