[Administration] Distributions : correctif actionAjaxUpdateProductOrder

backend/controllers/DistributionController.php

@@ -541,7 +541,7 @@ class DistributionController extends BackendController
         $idUser = false,
         $idPointSale = false,
         $idOrder = false,
-        $productOrderFormArray = []
+        $productOrderFormArray = ''
     )
     {
         \Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;