diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index c37b92707..da33e0a65 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -79,7 +79,10 @@ class ApplicationController < ActionController::Base
 
   # update session updated_at
   def session_update
-    session[:ping] = Time.now.utc.iso8601
+
+    # on many paralell requests, session got reinitialised if Time. is used, as workaround use DateTime.
+    #session[:ping] = Time.now.utc.iso8601
+    session[:ping] = DateTime.now.iso8601
 
     # check if remote ip need to be updated
     if !session[:remote_id] || session[:remote_id] != request.remote_ip
diff --git a/app/models/observer/session.rb b/app/models/observer/session.rb
index 7847a20a9..fdd96c2f8 100644
--- a/app/models/observer/session.rb
+++ b/app/models/observer/session.rb
@@ -14,7 +14,7 @@ class Observer::Session < ActiveRecord::Observer
 
   def check(record)
     return if !record.data
-
+    return if record[:request_type]
     # remember request type
     if record.data['request_type']
       record[:request_type] = record.data['request_type']