diff --git a/app/assets/javascripts/app/lib/app_post/auth.coffee b/app/assets/javascripts/app/lib/app_post/auth.coffee
index 7f95f2375..c15c6b2e7 100644
--- a/app/assets/javascripts/app/lib/app_post/auth.coffee
+++ b/app/assets/javascripts/app/lib/app_post/auth.coffee
@@ -150,10 +150,6 @@ class App.Auth
 
     # clear all in-memory data of all App.Model's
     for model_key, model_object of App
-      if _.isFunction(model_object.resetCallbacks)
-        model_object.resetCallbacks()
-      if _.isFunction(model_object.resetAttributes)
-        model_object.resetAttributes()
       if _.isFunction(model_object.clearInMemory)
         model_object.clearInMemory()
 
diff --git a/app/assets/javascripts/app/models/_application_model.coffee b/app/assets/javascripts/app/models/_application_model.coffee
index ba5b442d3..ce05630e6 100644
--- a/app/assets/javascripts/app/models/_application_model.coffee
+++ b/app/assets/javascripts/app/models/_application_model.coffee
@@ -816,17 +816,16 @@ set new attributes of model (remove already available attributes)
     )
 
   @clearInMemory: ->
-    return if !@className
+    # reset callbacks to session based functions
+    @resetCallbacks()
 
     # reset attributes to prevent cached forms on relogin
-    if !_.isEmpty(App[@className].org_configure_attributes)
-      App[@className].configure_attributes = App[@className].org_configure_attributes
+    @resetAttributes()
 
     # reset cached values of model
-    App[@className].deleteAll()
+    @deleteAll()
 
   @updateAttributes: (attributes) ->
-    return if !@className
     if _.isEmpty(@org_configure_attributes)
 
       # use jquery instead of ._clone() because we need a deep copy of the obj
diff --git a/script/build/test_slice_tests.sh b/script/build/test_slice_tests.sh
index 470d66942..7fd644c28 100755
--- a/script/build/test_slice_tests.sh
+++ b/script/build/test_slice_tests.sh
@@ -42,6 +42,7 @@ if [ "$LEVEL" == '1' ]; then
   rm test/browser/agent_user_profile_test.rb
   # test/browser/auth_test.rb
   rm test/browser/chat_test.rb
+  rm test/browser/customer_ticket_create_fields_test.rb
   rm test/browser/customer_ticket_create_test.rb
   rm test/browser/first_steps_test.rb
   # test/browser/form_test.rb
@@ -102,6 +103,7 @@ elif [ "$LEVEL" == '2' ]; then
   rm test/browser/agent_user_profile_test.rb
   rm test/browser/auth_test.rb
   rm test/browser/chat_test.rb
+  rm test/browser/customer_ticket_create_fields_test.rb
   rm test/browser/customer_ticket_create_test.rb
   rm test/browser/first_steps_test.rb
   rm test/browser/form_test.rb
@@ -162,6 +164,7 @@ elif [ "$LEVEL" == '3' ]; then
   rm test/browser/agent_user_profile_test.rb
   rm test/browser/auth_test.rb
   rm test/browser/chat_test.rb
+  rm test/browser/customer_ticket_create_fields_test.rb
   rm test/browser/customer_ticket_create_test.rb
   rm test/browser/first_steps_test.rb
   rm test/browser/form_test.rb
@@ -222,6 +225,7 @@ elif [ "$LEVEL" == '4' ]; then
   rm test/browser/agent_user_profile_test.rb
   rm test/browser/auth_test.rb
   rm test/browser/chat_test.rb
+  # test/browser/customer_ticket_create_fields_test.rb
   # test/browser/customer_ticket_create_test.rb
   rm test/browser/first_steps_test.rb
   rm test/browser/form_test.rb
@@ -281,6 +285,7 @@ elif [ "$LEVEL" == '5' ]; then
   # test/browser/agent_user_profile_test.rb
   rm test/browser/auth_test.rb
   rm test/browser/chat_test.rb
+  rm test/browser/customer_ticket_create_fields_test.rb
   rm test/browser/customer_ticket_create_test.rb
   rm test/browser/first_steps_test.rb
   rm test/browser/form_test.rb
@@ -343,6 +348,7 @@ elif [ "$LEVEL" == '6' ]; then
   rm test/browser/agent_user_profile_test.rb
   rm test/browser/auth_test.rb
   # test/browser/chat_test.rb
+  rm test/browser/customer_ticket_create_fields_test.rb
   rm test/browser/customer_ticket_create_test.rb
   # test/browser/first_steps_test.rb
   rm test/browser/form_test.rb
diff --git a/test/browser/customer_ticket_create_fields_test.rb b/test/browser/customer_ticket_create_fields_test.rb
new file mode 100644
index 000000000..1b7b59add
--- /dev/null
+++ b/test/browser/customer_ticket_create_fields_test.rb
@@ -0,0 +1,45 @@
+require 'browser_test_helper'
+
+class CustomerTicketCreateFieldsTest < TestCase
+  def test_customer_ticket_create_fields
+    @browser = browser_instance
+
+    # create agent session and fetch object attributes
+    login(
+      username: 'master@example.com',
+      password: 'test',
+      url:      browser_url,
+    )
+    # remove local object attributes bound to the session
+    logout()
+
+    # re-create agent session and fetch object attributes
+    login(
+      username: 'master@example.com',
+      password: 'test',
+      url:      browser_url,
+    )
+    # re-remove local object attributes bound to the session
+    # there was an issue (#1856) where the old attribute values
+    # persisted and were stored as the original attributes
+    logout()
+
+    # create customer session and fetch object attributes
+    login(
+      username: 'nicole.braun@zammad.org',
+      password: 'test',
+      url:      browser_url,
+    )
+
+    # customer ticket create
+    click(css: 'a[href="#new"]', only_if_exists: true)
+    click(css: 'a[href="#customer_ticket_new"]')
+    sleep 2
+
+    # ensure that the object attributes of the agent session
+    # were removed properly and won't get displayed in the form
+    exists_not(
+      css: '.newTicket input[name="customer_id"]',
+    )
+  end
+end