diff --git a/cart-grain.go b/cart-grain.go
index 0432b07..a8dc7cd 100644
--- a/cart-grain.go
+++ b/cart-grain.go
@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"slices"
 	"sync"
 	"time"
@@ -475,6 +476,7 @@ func (c *CartGrain) HandleMessage(message *Message, isReplay bool) (*FrameWithPa
 	case OrderCompletedType:
 		msg, ok := message.Content.(*messages.OrderCreated)
 		if !ok {
+			log.Printf("expected OrderCompleted, got %T", message.Content)
 			err = fmt.Errorf("expected OrderCompleted")
 		} else {
 			c.OrderReference = msg.OrderId