diff --git a/controllers/contact_crtl.php b/controllers/contact_crtl.php
index 11f1a35..57daf97 100644
--- a/controllers/contact_crtl.php
+++ b/controllers/contact_crtl.php
@@ -1,7 +1,7 @@
 <?php
 
 function contact_ctrl() {
-    require('controllers/auth_utilities.php');
+    require_once('controllers/auth_utilities.php');
     if (!has_any_role(['gestionnaire', 'administration'])) {
         header('Location: index.php?route=auth&ask=ajout_personnes');
         exit;
diff --git a/controllers/lecture_page_ctrl.php b/controllers/lecture_page_ctrl.php
index 6b5e870..8d47d19 100644
--- a/controllers/lecture_page_ctrl.php
+++ b/controllers/lecture_page_ctrl.php
@@ -2,7 +2,7 @@
 
 function planning_afficher_ctrl()
 {
-    require('controllers/auth_utilities.php');
+    require_once('controllers/auth_utilities.php');
     verify_grants('planning');
     require('models/connection.php');
     require('models/lecture_page_model.php');
diff --git a/controllers/modif_compte_ctrl.php b/controllers/modif_compte_ctrl.php
index 3fba622..66848d1 100644
--- a/controllers/modif_compte_ctrl.php
+++ b/controllers/modif_compte_ctrl.php
@@ -1,7 +1,7 @@
 <?php
 
 function modif_utilisateurs_form_ctrl() {
-    require('controllers/auth_utilities.php');
+    require_once('controllers/auth_utilities.php');
     verify_grants('modif_utilisateurs_form', 'administration');
     require('models/connection.php');
     $c = connection();
@@ -19,7 +19,7 @@ function modif_utilisateurs_form_ctrl() {
 }
 
 function modif_utilisateurs_write_ctrl() {
-    require('controllers/auth_utilities.php');
+    require_once('controllers/auth_utilities.php');
     verify_grants('modif_utilisateurs', 'administration');
     if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
         header('Location: index.php?route=modif_utilisateurs_form');
diff --git a/controllers/operation_ctrl.php b/controllers/operation_ctrl.php
index 3df2b27..71fe957 100644
--- a/controllers/operation_ctrl.php
+++ b/controllers/operation_ctrl.php
@@ -1,7 +1,7 @@
 <?php
 
 function operations_form_ctrl() {
-    require('controllers/auth_utilities.php');
+    require_once('controllers/auth_utilities.php');
     if (!has_any_role(['gestionnaire', 'administration'])) {
         header('Location: index.php?route=auth&ask=operations');
         exit;
@@ -10,7 +10,7 @@ function operations_form_ctrl() {
 }
 
 function add_operation_write_ctrl() {
-    require('controllers/auth_utilities.php');
+    require_once('controllers/auth_utilities.php');
     if (!has_any_role(['gestionnaire', 'administration'])) {
         header('Location: index.php?route=auth&ask=operations');
         exit;
diff --git a/controllers/utilisateur_ctrl.php b/controllers/utilisateur_ctrl.php
index 893f065..b78563c 100644
--- a/controllers/utilisateur_ctrl.php
+++ b/controllers/utilisateur_ctrl.php
@@ -1,13 +1,13 @@
 <?php
 
 function add_utilisateurs_form_ctrl() {
-    require('controllers/auth_utilities.php');
+    require_once('controllers/auth_utilities.php');
     verify_grants('add_utilisateurs_form', 'administration');
     require('views/creation_compte_view.php');
 }
 
 function add_utilisateurs_write_ctrl() {
-    require('controllers/auth_utilities.php');
+    require_once('controllers/auth_utilities.php');
     verify_grants('add_utilisateurs', 'administration');
     if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
         header('Location: index.php?route=add_utilisateurs_form');
diff --git a/models/user_crud.php b/models/user_crud.php
index 55baebd..9e3e3ad 100644
--- a/models/user_crud.php
+++ b/models/user_crud.php
@@ -11,6 +11,6 @@ function recuperation_auth(PDO $connex, string $login):?array {
     $prep->execute();
     $auth = $prep->fetch(PDO::FETCH_ASSOC);
     $prep->closeCursor();
-    return $auth;
+    return $auth ?: null;
  }
   
\ No newline at end of file