diff --git a/lib/Transformer.js b/lib/Transformer.js
index 87136d0..2fb3db3 100644
--- a/lib/Transformer.js
+++ b/lib/Transformer.js
@@ -21,6 +21,8 @@ module.exports = {
                         conversationDetails.__myRole = role));
                 // getMyRole is deprecated. Please use sdk.agentId
                 conversationDetails.getMyRole = () => conversationDetails.__myRole;
+                conversationDetails.__oldParticipants = [];
+                conversationDetails.participants.forEach(p => conversationDetails.__oldParticipants.push(p));
                 conversationDetails.participants = [];
                 Object.keys(conversationDetails.participantsPId).forEach(role =>
                     conversationDetails.participantsPId[role].forEach(id =>
@@ -37,7 +39,7 @@ module.exports = {
     },
     '.ams.cm.UpdateConversationField': (msg, agent) => {
         msg.body.conversationField.forEach(f => {
-            if (f.field === 'ParticipantsChange') {
+            if (f.field === 'ParticipantsChange' && !f.userId) {
                 f.userId = agent.__oldAgentId;
             }
         });