Finally working, fixed issue

app/livechat/server/roomType.js

@@ -26,6 +26,11 @@ class LivechatRoomTypeServer extends LivechatRoomType {
 	canAccessUploadedFile({ rc_token, rc_rid } = {}) {
 		return rc_token && rc_rid && Rooms.findOneOpenByRoomIdAndVisitorToken(rc_rid, rc_token);
 	}
+
+	getReadReceiptsExtraData(message) {
+		const { token } = message;
+		return { token };
+	}
 }
 
 roomTypes.add(new LivechatRoomTypeServer());

app/utils/lib/RoomTypeConfig.js

@@ -264,4 +264,17 @@ export class RoomTypeConfig {
 		return false;
 	}
 
+	/**
+   * Get receipt's extra token for livechat users
+   * @param {object} message
+   * @return {object} Token for user
+   */
+	getReadReceiptsExtraData(message) {
+		if (!Meteor.isServer) {
+			return {};
+		}
+		const { token } = message;
+		return { token };
+	}
+
 }

imports/message-read-receipt/server/hooks.js

@@ -13,7 +13,7 @@ callbacks.add('afterSaveMessage', (message, room) => {
 	Subscriptions.setAsReadByRoomIdAndUserId(room._id, message.u._id);
 
 	// mark message as read as well
-	ReadReceipt.markMessageAsReadBySender(message, room._id, message.u._id, message.token);
+	ReadReceipt.markMessageAsReadBySender(message, room._id, message.u._id);
 });
 
 callbacks.add('afterReadMessages', (rid, { userId, lastSeen }) => {

imports/message-read-receipt/server/lib/ReadReceipt.js

@@ -2,6 +2,7 @@ import { Meteor } from 'meteor/meteor';
 import { Random } from 'meteor/random';
 import { ReadReceipts, Subscriptions, Messages, Rooms, Users, LivechatVisitors } from '../../../../app/models';
 import { settings } from '../../../../app/settings';
+import { roomTypes } from '../../../../app/utils';
 
 const rawReadReceipts = ReadReceipts.model.rawCollection();
 
@@ -40,7 +41,7 @@ export const ReadReceipt = {
 		updateMessages(roomId);
 	},
 
-	markMessageAsReadBySender(message, roomId, userId, extraData) {
+	markMessageAsReadBySender(message, roomId, userId) {
 		if (!settings.get('Message_Read_Receipt_Enabled')) {
 			return;
 		}
@@ -50,6 +51,7 @@ export const ReadReceipt = {
 		if (message.unread && message.ts < firstSubscription.ls) {
 			Messages.setAsReadById(message._id, firstSubscription.ls);
 		}
+		const extraData = roomTypes.getConfig('l').getReadReceiptsExtraData(message);
 
 		this.storeReadReceipts([{ _id: message._id }], roomId, userId, extraData);
 	},
@@ -63,7 +65,7 @@ export const ReadReceipt = {
 				userId,
 				messageId: message._id,
 				ts,
-				token: extraData,
+				...extraData,
 			}));
 
 			if (receipts.length === 0) {
@@ -81,7 +83,7 @@ export const ReadReceipt = {
 	getReceipts(message) {
 		return ReadReceipts.findByMessageId(message._id).map((receipt) => ({
 			...receipt,
-			user: (receipt.token && !(Object.keys(receipt.token).length === 0 && receipt.token.constructor === Object)) ? LivechatVisitors.getVisitorByToken(message.token, { fields: { username: 1, name: 1 } }) : Users.findOneById(receipt.userId, { fields: { username: 1, name: 1 } }),
+			user: receipt.token ? LivechatVisitors.getVisitorByToken(receipt.token, { fields: { username: 1, name: 1 } }) : Users.findOneById(receipt.userId, { fields: { username: 1, name: 1 } }),
 		}));
 	},
 };