diff --git a/sessions/sessions.go b/sessions/sessions.go
index 977964cfc..9a9fe42ac 100644
--- a/sessions/sessions.go
+++ b/sessions/sessions.go
@@ -2084,7 +2084,7 @@ func (sS *SessionS) BiRPCv1InitiateSession(clnt rpcclient.ClientConnector,
 		rplyAttr, err := sS.processAttributes(args.CGREvent, args.ArgDispatcher,
 			args.AttributeIDs)
 		if err == nil {
-			args.CGREvent = rplyAttr.CGREvent
+			args.CGREvent = rplyAttr.CGREvent.Clone() // avoid concurrency with rply.Attributes
 			if tntIface, has := args.CGREvent.Event[utils.MetaTenant]; has {
 				// special case when we want to overwrite the tenant
 				args.CGREvent.Tenant = tntIface.(string)
@@ -2307,7 +2307,7 @@ func (sS *SessionS) BiRPCv1UpdateSession(clnt rpcclient.ClientConnector,
 		rplyAttr, err := sS.processAttributes(args.CGREvent, args.ArgDispatcher,
 			args.AttributeIDs)
 		if err == nil {
-			args.CGREvent = rplyAttr.CGREvent
+			args.CGREvent = rplyAttr.CGREvent.Clone()
 			if tntIface, has := args.CGREvent.Event[utils.MetaTenant]; has {
 				// special case when we want to overwrite the tenant
 				args.CGREvent.Tenant = tntIface.(string)