diff --git a/app/Http/Controllers/ReportActivityMaterialController.php b/app/Http/Controllers/ReportActivityMaterialController.php
index 5588235..a661e80 100644
--- a/app/Http/Controllers/ReportActivityMaterialController.php
+++ b/app/Http/Controllers/ReportActivityMaterialController.php
@@ -107,7 +107,8 @@ class ReportActivityMaterialController extends Controller
return Datatables::of($data)
->addIndexColumn()
->addColumn('action', function($row){
- $actionBtn = '';
+ $actionBtn = '';
+ $actionBtn .= '';
return $actionBtn;
})
->rawColumns(['action'])->make(true);