Improved error handling.

app/assets/javascripts/app/controllers/chat.coffee

@@ -775,10 +775,19 @@ class ChatWindow extends App.Controller
     # cleanup params
     fqdn      = App.Config.get('fqdn')
     http_type = App.Config.get('http_type')
+    url       = ''
+    session   = @session
+
+    # in case we do not have a model, create one
+    if session && !session.uiUrl
+      session = new App.ChatSession(session)
+    if session && session.uiUrl
+      url = session.uiUrl()
+
     clean_params =
       id: id
       prefilledParams:
-        body: "#{http_type}://#{fqdn}#{@session.uiUrl()}"
+        body: "#{http_type}://#{fqdn}/#{url}"
         title: 'Chat'
 
     App.TaskManager.execute(

lib/sessions/event/chat_status_customer.rb

@@ -13,18 +13,20 @@ class Sessions::Event::ChatStatusCustomer < Sessions::Event::ChatBase
 
       # update recipients of existing sessions
       chat_session = Chat::Session.find_by(session_id: session_id)
-      chat_session.add_recipient(@client_id, true)
+      if chat_session
+        chat_session.add_recipient(@client_id, true)
 
-      # sent url update to agent
-      if @payload['data']['url']
-        message = {
-          event: 'chat_session_notice',
-          data: {
-            session_id: chat_session.session_id,
-            message: @payload['data']['url'],
-          },
-        }
-        chat_session.send_to_recipients(message, @client_id)
+        # sent url update to agent
+        if @payload['data']['url']
+          message = {
+            event: 'chat_session_notice',
+            data: {
+              session_id: chat_session.session_id,
+              message: @payload['data']['url'],
+            },
+          }
+          chat_session.send_to_recipients(message, @client_id)
+        end
       end
     end