m

app/Http/Controllers/Admin/OrderController.php

@@ -788,7 +788,7 @@ class OrderController extends Controller
             if($logistics_id){
                 $params['logistics_id'] = $logistics_id;
             }else{
-                $params['logistics_id'] = null;
+                $params['logistics_id'] = '';
             }
 
             $result = Order::where('id', $order_id)->update($params);