diff --git a/msg.go b/msg.go
index 6d10717..fa0f113 100644
--- a/msg.go
+++ b/msg.go
@@ -275,14 +275,16 @@ func parseSubTypeMessagePillageInc(m *ChatWarsMessage, r *regexp.Regexp) (*ChatW
 
 func zipMessages() ([]byte, error) {
 	bkp := DataBackup{}
+	msgs := new([]ChatWarsMessage)
 	ids := getSQLListID64(`SELECT om.obj_id id FROM obj_msg om;`)
 	for _, id := range ids {
 		m, err := getMsg(id)
 		logOnError(err, "zipMessages : getMsg")
 		if err == nil {
-			append(bkp.Messages, m)
+			append(msgs, m)
 		}
 	}
+	bkp.Messages = msgs
 	b, err := json.Marshal(bkp)
 	logOnError(err, "exportMessages : Marshal")
 	if err != nil {