diff --git a/app/assets/javascripts/app/controllers/_application_controller_generic.coffee b/app/assets/javascripts/app/controllers/_application_controller_generic.coffee
index 1c82a8d1e..6c8dfa547 100644
--- a/app/assets/javascripts/app/controllers/_application_controller_generic.coffee
+++ b/app/assets/javascripts/app/controllers/_application_controller_generic.coffee
@@ -87,6 +87,7 @@ class App.ControllerGenericEdit extends App.ControllerModal
         ui.close()
 
       fail: (settings, details) ->
+        App[ ui.genericObject ].fetch(id: @id)
         ui.log 'errors'
         ui.formEnable(e)
         ui.controller.showAlert(details.error_human || details.error || 'Unable to update object!')
diff --git a/app/assets/javascripts/app/controllers/widget/translation_inline.coffee b/app/assets/javascripts/app/controllers/widget/translation_inline.coffee
index 4a27407fd..b49757943 100644
--- a/app/assets/javascripts/app/controllers/widget/translation_inline.coffee
+++ b/app/assets/javascripts/app/controllers/widget/translation_inline.coffee
@@ -23,6 +23,7 @@ class Widget extends App.Controller
         if e.altKey && e.ctrlKey && !e.metaKey
           hotkeys = true
       if hotkeys && e.keyCode is 84
+        e.preventDefault()
         @toogle()
     )
 
diff --git a/app/assets/javascripts/app/lib/base/jquery.contenteditable.js b/app/assets/javascripts/app/lib/base/jquery.contenteditable.js
index 606402b01..cf32462c8 100644
--- a/app/assets/javascripts/app/lib/base/jquery.contenteditable.js
+++ b/app/assets/javascripts/app/lib/base/jquery.contenteditable.js
@@ -179,7 +179,7 @@
         || e.keyCode == 76
         || e.keyCode == 85
         || e.keyCode == 86
-        || e.keyCode == 87
+        || e.keyCode == 88
         || e.keyCode == 90
         || e.keyCode == 89)) {
         e.preventDefault()
@@ -219,7 +219,7 @@
         if (e.keyCode == 86) {
           document.execCommand('strikeThrough')
         }
-        if (e.keyCode == 87) {
+        if (e.keyCode == 88) {
           document.execCommand('unlink')
         }
         if (e.keyCode == 89) {
diff --git a/app/models/user.rb b/app/models/user.rb
index 16d3071b9..93474015c 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -45,7 +45,7 @@ class User < ApplicationModel
   after_destroy   :avatar_destroy
 
   has_and_belongs_to_many :groups,          after_add: :cache_update, after_remove: :cache_update, class_name: 'Group'
-  has_and_belongs_to_many :roles,           after_add: [:cache_update, :check_notifications], after_remove: :cache_update, before_add: :validate_agent_limit, class_name: 'Role'
+  has_and_belongs_to_many :roles,           after_add: [:cache_update, :check_notifications], after_remove: :cache_update, before_add: :validate_agent_limit, before_remove: :last_admin_check, class_name: 'Role'
   has_and_belongs_to_many :organizations,   after_add: :cache_update, after_remove: :cache_update, class_name: 'Organization'
   #has_many                :permissions,     class_name: 'Permission', through: :roles, class_name: 'Role'
   has_many                :tokens,          after_add: :cache_update, after_remove: :cache_update
@@ -860,6 +860,27 @@ returns
     }
   end
 
+=begin
+
+checks if the current user is the last one
+with admin permissions.
+
+Raises
+
+raise 'Minimum one user need to have admin permissions'
+
+=end
+
+  def last_admin_check(role)
+    ticket_admin_role_ids = Role.joins(:permissions).where(permissions: { name: ['admin', 'admin.user'] }).pluck(:id)
+    count                 = User.joins(:roles).where(roles: { id: ticket_admin_role_ids }, users: { active: true }).count
+    if ticket_admin_role_ids.include?(role.id)
+      count -= 1
+    end
+
+    raise Exceptions::UnprocessableEntity, 'Minimum one user needs to have admin permissions.' if count < 1
+  end
+
   def validate_agent_limit(role)
     return if !Setting.get('system_agent_limit')
 
diff --git a/test/unit/user_test.rb b/test/unit/user_test.rb
index e193f6f4b..2fd0ca1d5 100644
--- a/test/unit/user_test.rb
+++ b/test/unit/user_test.rb
@@ -544,4 +544,72 @@ class UserTest < ActiveSupport::TestCase
 
   end
 
+  test 'min admin permission check' do
+    User.with_permissions('admin').each(&:destroy)
+
+    # store current admin count
+    admin_count_inital = User.with_permissions('admin').count
+    assert_equal(0, admin_count_inital)
+
+    # create two admin users
+    random = rand(999_999_999)
+    admin1 = User.create_or_update(
+      login: "1admin-role#{random}@example.com",
+      firstname: 'Role',
+      lastname: "Admin#{random}",
+      email: "admin-role#{random}@example.com",
+      password: 'adminpw',
+      active: true,
+      roles: Role.where(name: %w(Admin Agent)),
+      updated_by_id: 1,
+      created_by_id: 1,
+    )
+
+    random = rand(999_999_999)
+    admin2 = User.create_or_update(
+      login: "2admin-role#{random}@example.com",
+      firstname: 'Role',
+      lastname: "Admin#{random}",
+      email: "admin-role#{random}@example.com",
+      password: 'adminpw',
+      active: true,
+      roles: Role.where(name: %w(Admin Agent)),
+      updated_by_id: 1,
+      created_by_id: 1,
+    )
+
+    random = rand(999_999_999)
+    admin3 = User.create_or_update(
+      login: "2admin-role#{random}@example.com",
+      firstname: 'Role',
+      lastname: "Admin#{random}",
+      email: "admin-role#{random}@example.com",
+      password: 'adminpw',
+      active: true,
+      roles: Role.where(name: %w(Admin Agent)),
+      updated_by_id: 1,
+      created_by_id: 1,
+    )
+
+    admin_count_inital = User.with_permissions('admin').count
+    assert_equal(3, admin_count_inital)
+
+    admin1.update_attribute(:roles, Role.where(name: %w(Agent)))
+
+    admin_count_inital = User.with_permissions('admin').count
+    assert_equal(2, admin_count_inital)
+
+    admin2.update_attribute(:roles, Role.where(name: %w(Agent)))
+
+    admin_count_inital = User.with_permissions('admin').count
+    assert_equal(1, admin_count_inital)
+
+    assert_raises(Exceptions::UnprocessableEntity) {
+      admin3.update_attribute(:roles, Role.where(name: %w(Agent)))
+    }
+
+    admin_count_inital = User.with_permissions('admin').count
+    assert_equal(1, admin_count_inital)
+  end
+
 end