diff --git a/app/assets/javascripts/app/controllers/_ui_element/_application_ui_element.coffee b/app/assets/javascripts/app/controllers/_ui_element/_application_ui_element.coffee
index eefb63a8f..399ffbead 100644
--- a/app/assets/javascripts/app/controllers/_ui_element/_application_ui_element.coffee
+++ b/app/assets/javascripts/app/controllers/_ui_element/_application_ui_element.coffee
@@ -203,13 +203,16 @@ class App.UiElement.ApplicationUiElement
       for valueItem in value
         if @_selectedOptionsIsSelectedItem(valueItem, record)
           return true
-    if typeof value is 'string' || typeof value is 'number' || typeof value is 'boolean'
+    if value is null || value is undefined || typeof value is 'string' || typeof value is 'number' || typeof value is 'boolean'
       if @_selectedOptionsIsSelectedItem(value, record)
         return true
     false
 
-  @_selectedOptionsIsSelectedItem: (value, record) ->
+  @_selectedOptionsIsSelectedItem: (valueOrigin, record) ->
     # if name or value is matching
+    value = valueOrigin
+    if value is null || value is undefined
+      value = ''
     if typeof value is 'string' || typeof value is 'number' || typeof value is 'boolean'
       if record.value.toString() is value.toString() || record.name.toString() is value.toString()
         return true
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom.coffee b/app/assets/javascripts/app/controllers/ticket_zoom.coffee
index 4a791b9c8..f93993b8c 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom.coffee
@@ -359,7 +359,8 @@ class App.TicketZoom extends App.Controller
       @sidebar = new App.TicketZoomSidebar(
         el:           el.find('.tabsSidebar')
         sidebarState: @sidebarState
-        ticket:       @ticket
+        object_id:    @ticket.id
+        model:        'Ticket'
         taskGet:      @taskGet
         task_key:     @task_key
         tags:         @tags
@@ -404,7 +405,7 @@ class App.TicketZoom extends App.Controller
 
   autosaveStop: =>
     @autosaveLast = {}
-    @clearInterval('autosave')
+    @el.off('change.local blur.local keyup.local paste.local input.local')
 
   autosaveStart: =>
     if !@autosaveLast
@@ -424,7 +425,9 @@ class App.TicketZoom extends App.Controller
       @markFormDiff(modelDiff)
       @taskUpdateAll(modelDiff)
 
-    @interval(update, 2800, 'autosave')
+    @el.on('change.local blur.local keyup.local paste.local input.local', 'form, .js-textarea', (e) =>
+      @delay(update, 250, 'ticket-zoom-form-update')
+    )
 
   currentStore: =>
     return if !@ticket
@@ -459,6 +462,16 @@ class App.TicketZoom extends App.Controller
 
   formDiff: (currentParams, currentStore) ->
 
+    # do not compare null or undefined value
+    if currentStore.ticket
+      for key, value of currentStore.ticket
+        if value is null || value is undefined
+          currentStore.ticket[key] = ''
+    if currentParams.ticket
+      for key, value of currentParams.ticket
+        if value is null || value is undefined
+          currentParams.ticket[key] = ''
+
     # get diff of model
     modelDiff =
       ticket:  App.Utils.formDiff(currentParams.ticket, currentStore.ticket)
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar.coffee b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar.coffee
index d30662b20..2a58e5af4 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom/sidebar.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom/sidebar.coffee
@@ -1,12 +1,8 @@
-class App.TicketZoomSidebar extends App.Controller
-  constructor: ->
-    super
-    ticket       = App.Ticket.fullLocal(@ticket.id)
-    @subscribeId = ticket.subscribe(@render)
-    @render(ticket)
-
-  release: =>
-    App.Ticket.unsubscribe(@subscribeId)
+class App.TicketZoomSidebar extends App.ObserverController
+  model: 'Ticket'
+  observeNot:
+    created_at: true
+    updated_at: true
 
   render: (ticket) =>
 
@@ -17,13 +13,13 @@ class App.TicketZoomSidebar extends App.Controller
       show = (ticket) =>
         el.find('.edit').html('')
 
-        defaults   = ticket.attributes()
+        defaults = ticket.attributes()
         delete defaults.article # ignore article infos
-        task_state = @taskGet('ticket')
-        modelDiff  = App.Utils.formDiff(task_state, defaults)
+        taskState = @taskGet('ticket')
+        modelDiff = App.Utils.formDiff(taskState, defaults)
 
-        if !_.isEmpty(task_state)
-          defaults = _.extend(defaults, task_state)
+        if !_.isEmpty(taskState)
+          defaults = _.extend(defaults, taskState)
 
         new App.ControllerForm(
           el:       el.find('.edit')
@@ -36,7 +32,7 @@ class App.TicketZoomSidebar extends App.Controller
           params:    defaults
           #bookmarkable: true
         )
-        #console.log('Ichanges', modelDiff, task_state, ticket.attributes())
+        #console.log('Ichanges', modelDiff, taskState, ticket.attributes(), defaults)
         #@markFormDiff( modelDiff )
 
       show(ticket)