diff --git a/server/marketserver/common/types.go b/server/marketserver/common/types.go
index 28c39328..287d071e 100644
--- a/server/marketserver/common/types.go
+++ b/server/marketserver/common/types.go
@@ -22,7 +22,7 @@ type ActivitySaleEvent struct {
 			To string `json:"to"`
 			From string `json:"from"`
 			OrderId string `json:"order_id"`
-			Asset struct {
+			Asset [] struct {
 				TokenId string `json:"token_id"`
 				ContractType string `json:"contract_type"`
 				ContractAddress string `json:"contract_address"`
diff --git a/server/marketserver/task/taskmgr.go b/server/marketserver/task/taskmgr.go
index 1f741997..961b5fa7 100644
--- a/server/marketserver/task/taskmgr.go
+++ b/server/marketserver/task/taskmgr.go
@@ -176,8 +176,8 @@ func (this* taskMgr) activitySaleCb(ds *f5.DataSet) bool {
 			{"order_id", p.Data.Details.OrderId},
 			{"chain", p.Chain},
 			{"net_id", q5.ToString(netId)},
-			{"token_id", p.Data.Details.Asset.TokenId},
-			{"contract_address", p.Data.Details.Asset.ContractAddress},
+			{"token_id", p.Data.Details.Asset[0].TokenId},
+			{"contract_address", p.Data.Details.Asset[0].ContractAddress},
 			{"buyer", p.Data.Details.From},
 			{"seller", p.Data.Details.To},
 			{"event_id", p.EventId},