diff --git a/locales/fr/main.lang.php b/locales/fr/main.lang.php
index 3d64be8..35c8027 100644
--- a/locales/fr/main.lang.php
+++ b/locales/fr/main.lang.php
@@ -9,10 +9,12 @@
 # DOT NOT MODIFY THIS FILE !
 #
 
-l10n::$locales['You must provide a content.']   = 'Vous devez fournir un contenu.';
-l10n::$locales['Mail successuffly sent.']       = 'Mail envoyer avec succès.';
-l10n::$locales['Mailto:']                       = 'Envoyer à :';
-l10n::$locales['Subject:']                      = 'Sujet :';
-l10n::$locales['Active mail headers']           = 'Activer les entêtes de mail';
-l10n::$locales['Mail test']                     = 'Testeur de mail';
-l10n::$locales['Send a simple mail from admin'] = 'Envoyer un simple mail depuis l\'admin';
+use Dotclear\Helper\L10n;
+
+L10n::$locales['You must provide a content.']   = 'Vous devez fournir un contenu.';
+L10n::$locales['Mail successuffly sent.']       = 'Mail envoyer avec succès.';
+L10n::$locales['Mailto:']                       = 'Envoyer à :';
+L10n::$locales['Subject:']                      = 'Sujet :';
+L10n::$locales['Active mail headers']           = 'Activer les entêtes de mail';
+L10n::$locales['Mail test']                     = 'Testeur de mail';
+L10n::$locales['Send a simple mail from admin'] = 'Envoyer un simple mail depuis l\'admin';
diff --git a/src/Backend.php b/src/Backend.php
index 5a8f346..e8fb6ce 100644
--- a/src/Backend.php
+++ b/src/Backend.php
@@ -24,7 +24,9 @@ class Backend extends dcNsProcess
 {
     public static function init(): bool
     {
-        static::$init = defined('DC_CONTEXT_ADMIN') && dcCore::app()->auth->isSuperAdmin();
+        static::$init = defined('DC_CONTEXT_ADMIN')
+            && !is_null(dcCore::app()->auth)
+            && dcCore::app()->auth->isSuperAdmin();
 
         return static::$init;
     }
@@ -35,6 +37,11 @@ class Backend extends dcNsProcess
             return false;
         }
 
+        // nullsafe
+        if (is_null(dcCore::app()->auth) || is_null(dcCore::app()->adminurl)) {
+            return false;
+        }
+
         dcCore::app()->menu[dcAdmin::MENU_PLUGINS]->addItem(
             My::name(),
             dcCore::app()->adminurl->get('admin.plugin.' . My::id()),
diff --git a/src/Manage.php b/src/Manage.php
index df97f73..5524bc8 100644
--- a/src/Manage.php
+++ b/src/Manage.php
@@ -36,7 +36,9 @@ class Manage extends dcNsProcess
 {
     public static function init(): bool
     {
-        static::$init = defined('DC_CONTEXT_ADMIN') && dcCore::app()->auth->isSuperAdmin();
+        static::$init = defined('DC_CONTEXT_ADMIN')
+            && !is_null(dcCore::app()->auth)
+            && dcCore::app()->auth->isSuperAdmin();
 
         return static::$init;
     }
@@ -47,6 +49,11 @@ class Manage extends dcNsProcess
             return false;
         }
 
+        // nullsafe
+        if (is_null(dcCore::app()->adminurl)) {
+            return false;
+        }
+
         $active_headers = !empty($_POST['active_headers']);
         $mail_to        = $_POST['mail_to']      ?? '';
         $mail_subject   = $_POST['mail_subject'] ?? '';
@@ -126,6 +133,11 @@ class Manage extends dcNsProcess
 
     private static function getHeaders(): array
     {
+        // nullsafe
+        if (is_null(dcCore::app()->blog)) {
+            return [];
+        }
+
         return [
             'From: ' . Mail::B64Header(dcCore::app()->blog->name) .
             '<no-reply@' . str_replace('http://', '', Http::getHost()) . ' >',