Undefined property: OpenAdmin\Admin\Grid\Filter\Presenter\Select::$label

[zhouitpro]

this is my code

$filter->equal('customer', trans('Customer'))->select(function($id) {
            $customer = Customer::find($id);
            if ($customer) {
                return [
                    $customer->customer_id => $customer->username,
                ];
            }
        })->ajax('/api/customer/search');

error file: vendor/open-admin-org/open-admin/src/Grid/Filter/Presenter/Select.php: 187