diff --git a/server/marketserver/api/v1/asset/asset.go b/server/marketserver/api/v1/asset/asset.go
index 6feca95c..3e06779a 100644
--- a/server/marketserver/api/v1/asset/asset.go
+++ b/server/marketserver/api/v1/asset/asset.go
@@ -76,6 +76,7 @@ WHERE A.idx > %d AND A.net_id = %d AND A.owner_address=? `,
 			jsonData := val.NftCache.GetJsonData()
 			if jsonData != nil {
 				if v, ok := jsonData.(map[string]interface{}); ok {
+					v := q5.MapClone(v)
 					if val.Param1 != 0 {
 						v["on_sale"] = 1
 					} else {