diff --git a/iap/iap.go b/iap/iap.go
index f9601b8d827c5164b581aad0275be6ff9e363f36..48e9e5b9e3acfec3d404fde288474aac3b7c1e74 100644
--- a/iap/iap.go
+++ b/iap/iap.go
@@ -283,6 +283,10 @@ func decodeReceiptGoogle(receipt string) (*ReceiptGoogle, error) {
 	if err := json.Unmarshal([]byte(unwrapped), &gr); err != nil {
 		return nil, errors.New("receipt is malformed")
 	}
+	if gr.PackageName == "" {
+		return nil, errors.New("receipt is malformed")
+	}
+
 	return &gr, nil
 }