Problème test user pour affichage lien d'administration

frontend/web/uploads/.gitignore

+*
+!.gitignore

producer/views/layouts/main.php

                             [
                                 'label' => '<span class="glyphicon glyphicon-cog"></span> Administration',
                                 'url' => Yii::$app->urlManagerBackend->createUrl(['site/index']),
-                                'visible' => Yii::$app->user->identity->isBoulanger(),
+                                'visible' => isset(Yii::$app->user->identity) && Yii::$app->user->identity->isBoulanger(),
                                 'options' => ['id' => 'btn-administration']
                             ],
                         ],