diff --git a/app/assets/javascripts/app/lib/app_post/z_searchable_ajax_select.coffee b/app/assets/javascripts/app/lib/app_post/z_searchable_ajax_select.coffee
index 117dc6694..4f2067d0c 100644
--- a/app/assets/javascripts/app/lib/app_post/z_searchable_ajax_select.coffee
+++ b/app/assets/javascripts/app/lib/app_post/z_searchable_ajax_select.coffee
@@ -75,9 +75,6 @@ class App.SearchableAjaxSelect extends App.SearchableSelect
     # refresh elements
     @refreshElements()
 
-    # execute filter
-    @filterByQuery originalQuery
-
   renderResponseItemAjax: (elem, data) ->
     result = _.find(data.details, (detailElem) -> detailElem.type == elem.type and detailElem.id == elem.id)
 
diff --git a/app/views/tests/form_autocompletion_ajax.html.erb b/app/views/tests/form_autocompletion_ajax.html.erb
new file mode 100644
index 000000000..b0d71a826
--- /dev/null
+++ b/app/views/tests/form_autocompletion_ajax.html.erb
@@ -0,0 +1,21 @@
+
+<link rel="stylesheet" href="/assets/tests/qunit-1.21.0.css">
+<%= javascript_include_tag "/assets/tests/qunit-1.21.0.js", "/assets/tests/form_autocompletion_ajax.js", nonce: true %>
+
+<style type="text/css">
+body {
+  padding-top: 0px;
+}
+</style>
+
+<%= javascript_tag nonce: true do -%>
+<% end -%>
+
+<div id="qunit" class="u-dontfold"></div>
+
+<div>
+  <form class="form-stacked pull-left">
+    <div id="forms"></div>
+    <button type="submit" class="btn btn-primary submit">Submit</button>
+  </form>
+</div>
diff --git a/config/routes/test.rb b/config/routes/test.rb
index 69f380570..18c8bb1d6 100644
--- a/config/routes/test.rb
+++ b/config/routes/test.rb
@@ -19,6 +19,7 @@ Zammad::Application.routes.draw do
   match '/tests_form_validation',             to: 'tests#form_validation',            via: :get
   match '/tests_form_column_select',          to: 'tests#form_column_select',         via: :get
   match '/tests_form_searchable_select',      to: 'tests#form_searchable_select',     via: :get
+  match '/tests_form_autocompletion_ajax',    to: 'tests#form_autocompletion_ajax',   via: :get
   match '/tests_form_ticket_perform_action',  to: 'tests#form_ticket_perform_action', via: :get
   match '/tests_form_sla_times',              to: 'tests#form_sla_times',             via: :get
   match '/tests_form_skip_rendering',         to: 'tests#form_skip_rendering',        via: :get
diff --git a/public/assets/tests/form_autocompletion_ajax.js b/public/assets/tests/form_autocompletion_ajax.js
new file mode 100644
index 000000000..d7738e6ad
--- /dev/null
+++ b/public/assets/tests/form_autocompletion_ajax.js
@@ -0,0 +1,71 @@
+function check_ajax_field(field, value, count, callback, waitTotal = 30000, wait = 0) {
+  $elementInput = $('[name="' + field + '"].js-shadow + .js-input')
+  if ($elementInput.val() != value) {
+    $elementInput.focus().val(value).trigger('input')
+  }
+
+  var $element = $('[name="' + field + '"]').closest('.searchableSelect').find('.js-optionsList')
+  var entries  = $element.find('li:not(.is-hidden)').length
+  var match    = entries == count
+
+  if (match || wait >= waitTotal) {
+    equal(entries, count, 'search result found for email address ' + value)
+    callback()
+    return
+  }
+
+  wait += 100
+  if (wait % 3000 == 0)  {
+    ok(true, 'check_ajax_field for ' + field + ' waiting ' + wait)
+  }
+
+  setTimeout(function() {
+    check_ajax_field(field, value, count, callback, waitTotal, wait)
+  }, 100)
+}
+
+test( "autocompletion_ajax check", function(assert) {
+  var done = assert.async(1)
+
+  $('#forms').append('<hr><h1>autocompletion_ajax check</h1><form id="form1"></form>')
+  var el = $('#form1')
+
+  new App.ControllerForm({
+    el:        el,
+    model:     {
+      configure_attributes: [
+        {
+          name:     'autocompletion_ajax1',
+          display:  'AutocompletionAjax1',
+          tag:      'autocompletion_ajax',
+          relation: 'User'
+        },
+      ]
+    },
+    autofocus: true
+  })
+
+  new Promise( (resolve, reject) => {
+    App.Auth.login({
+      data: {
+        username: 'master@example.com',
+        password: 'test',
+      },
+      success: resolve,
+      error: resolve
+    });
+  })
+  .then( function() {
+    return new Promise( (resolve, reject) => {
+      notEqual(App.Session.get(), undefined, 'User is logged in so the api requests will work')
+
+      check_ajax_field('autocompletion_ajax1', 'master@example.com', 1, resolve)
+    })
+  })
+  .then( function() {
+    return new Promise( (resolve, reject) => {
+      check_ajax_field('autocompletion_ajax1', 'xxx@example.com', 0, resolve)
+    })
+  })
+  .finally(done)
+})
diff --git a/spec/system/data_privacy_spec.rb b/spec/system/data_privacy_spec.rb
index 1d53d3d3a..7049ea42f 100644
--- a/spec/system/data_privacy_spec.rb
+++ b/spec/system/data_privacy_spec.rb
@@ -57,6 +57,22 @@ RSpec.describe 'Data Privacy', type: :system, searchindex: true, authenticated_a
         DataPrivacyTaskJob.perform_now
         expect(page).to have_text('completed', wait: 5)
       end
+
+      it 'deletes customer by email' do
+        visit 'system/data_privacy'
+        click '.js-new'
+
+        find(:css, '.js-input').send_keys(customer.email)
+        expect(page).to have_css('.searchableSelect-option-text', wait: 5)
+        click '.searchableSelect-option-text'
+        fill_in 'Are you sure?', with: 'DELETE'
+        expect(page).to have_text('DELETE ORGANIZATION?', wait: 5)
+        click '.js-submit'
+
+        expect(page).to have_text('in process', wait: 5)
+        DataPrivacyTaskJob.perform_now
+        expect(page).to have_text('completed', wait: 5)
+      end
     end
   end
 
diff --git a/spec/system/js/q_unit_spec.rb b/spec/system/js/q_unit_spec.rb
index 0f675c183..45be92d62 100644
--- a/spec/system/js/q_unit_spec.rb
+++ b/spec/system/js/q_unit_spec.rb
@@ -14,8 +14,8 @@ RSpec.describe 'QUnit', type: :system, authenticated_as: false, set_up: true, we
 
   def async_q_unit_tests(*args)
     q_unit_tests(*args) do
-      wait(10, interval: 4).until_constant do
-        find('.total').text
+      wait(120, interval: 3).until_constant do
+        page.has_css?('.total', wait: 0) ? find('.total').text : nil
       end
     end
   end
@@ -131,6 +131,17 @@ RSpec.describe 'QUnit', type: :system, authenticated_as: false, set_up: true, we
     end
   end
 
+  context 'Form AJAX', searchindex: true do
+    before do
+      configure_elasticsearch
+      rebuild_searchindex
+    end
+
+    it 'autocompletion ajax' do
+      async_q_unit_tests('form_autocompletion_ajax')
+    end
+  end
+
   context 'Table' do
 
     it 'Base' do