diff --git a/assets/js/components/conversations/chatWindows.js b/assets/js/components/conversations/chatWindows.js
index 256fbbad..f5121f6d 100644
--- a/assets/js/components/conversations/chatWindows.js
+++ b/assets/js/components/conversations/chatWindows.js
@@ -1203,7 +1203,7 @@ const ConvChatWindow = {
 					}
 
 					//Save the ID of the oldest message
-					ComunicWeb.components.conversations.service.setOldestMessageID(conversationID, result[0].ID);
+					ConvService.setOldestMessageID(conversationID, result[0].id);
 
 					//Display the list of messages
 					ComunicWeb.components.conversations.chatWindows.addOldMessages(conversationID, result);
diff --git a/assets/js/components/conversations/service.js b/assets/js/components/conversations/service.js
index 1b978bda..5ce912c2 100644
--- a/assets/js/components/conversations/service.js
+++ b/assets/js/components/conversations/service.js
@@ -46,7 +46,7 @@ const ConvService = {
 			//Register conversation locally
 			this.__serviceCache['conversation-' + conversationID] = {
 				conversationID: conversationID,
-				first_message_id: list.length == 0 ? 0 : list[0].ID,
+				first_message_id: list.length == 0 ? 0 : list[0].id,
 			};
 
 			// Register conversation remotly