diff --git a/openslides/core/static/templates/index.html b/openslides/core/static/templates/index.html
index 573f14312..bb6934f01 100644
--- a/openslides/core/static/templates/index.html
+++ b/openslides/core/static/templates/index.html
@@ -91,7 +91,7 @@
         </div>
         <!-- Login button -->
         <div ng-if="!operator.isAuthenticated()">
-          <a href  ng-click="openLoginForm()" class="headerlink" uib-dropdown-toggle>
+          <a href ui-sref="login" class="headerlink" uib-dropdown-toggle>
             <i class="fa fa-sign-in"></i>
             <translate>Login</translate>
           </a>
diff --git a/openslides/users/static/js/users/site.js b/openslides/users/static/js/users/site.js
index e03313d8c..ee5a8009b 100644
--- a/openslides/users/static/js/users/site.js
+++ b/openslides/users/static/js/users/site.js
@@ -117,6 +117,15 @@ angular.module('OpenSlidesApp.users.site', ['OpenSlidesApp.users'])
                 return $http({ 'method': 'OPTIONS', 'url': '/rest/users/group/' });
             }
         }
+    })
+    .state('login', {
+        template: null,
+        onEnter: ['$stateParams', 'ngDialog', function($stateParams, ngDialog) {
+            ngDialog.open({
+                template: 'static/templates/core/login-form.html',
+                controller: 'LoginFormCtrl',
+            });
+        }]
     });
 })
 
@@ -124,11 +133,16 @@ angular.module('OpenSlidesApp.users.site', ['OpenSlidesApp.users'])
     'operator',
     '$rootScope',
     '$http',
+    '$state',
     'Group',
-    function(operator, $rootScope, $http, Group) {
+    function(operator, $rootScope, $http, $state, Group) {
         // Put the operator into the root scope
         $http.get('/users/whoami/').success(function(data) {
             operator.setUser(data.user_id);
+            if (data.user_id == null) {
+                // redirect to login dialog if use is not logged in
+                $state.go('login');
+            }
         });
         $rootScope.operator = operator;
         // Load all Groups. They are needed later
@@ -696,12 +710,6 @@ angular.module('OpenSlidesApp.users.site', ['OpenSlidesApp.users'])
                 // DS.flush();
             });
         };
-        $scope.openLoginForm = function () {
-            ngDialog.open({
-                template: 'static/templates/core/login-form.html',
-                controller: 'LoginFormCtrl',
-            });
-        };
     }
 ])