update

cart-grain.go

@@ -336,6 +336,8 @@ func (c *CartGrain) HandleMessage(message *Message, isReplay bool) (*FrameWithPa
 					}
 				}
 			}
+			if len(items) > 0 {
+
 				c.Deliveries = append(c.Deliveries, &CartDelivery{
 					Id:       c.lastDeliveryId,
 					Provider: msg.Provider,
@@ -345,11 +347,10 @@ func (c *CartGrain) HandleMessage(message *Message, isReplay bool) (*FrameWithPa
 				c.Processing = true
 				go func() {
 					time.Sleep(5 * time.Second)
-				c.mu.Lock()
 					c.Processing = false
-				c.mu.Unlock()
 				}()
 			}
+		}
 	case RemoveDeliveryType:
 		msg, ok := message.Content.(*messages.RemoveDelivery)
 		if !ok {