update

cart-grain.go

@@ -336,19 +336,20 @@ func (c *CartGrain) HandleMessage(message *Message, isReplay bool) (*FrameWithPa
 					}
 				}
 			}
-			c.Deliveries = append(c.Deliveries, &CartDelivery{
-				Id:       c.lastDeliveryId,
-				Provider: msg.Provider,
-				Price:    49,
-				Items:    items,
-			})
-			c.Processing = true
-			go func() {
-				time.Sleep(5 * time.Second)
-				c.mu.Lock()
-				c.Processing = false
-				c.mu.Unlock()
-			}()
+			if len(items) > 0 {
+
+				c.Deliveries = append(c.Deliveries, &CartDelivery{
+					Id:       c.lastDeliveryId,
+					Provider: msg.Provider,
+					Price:    49,
+					Items:    items,
+				})
+				c.Processing = true
+				go func() {
+					time.Sleep(5 * time.Second)
+					c.Processing = false
+				}()
+			}
 		}
 	case RemoveDeliveryType:
 		msg, ok := message.Content.(*messages.RemoveDelivery)