Forbid a user to delete himself on the admin page

src/Controller/UserController.php

@@ -169,8 +169,14 @@ class UserController extends BaseAdminController
     #[Route(path: '/{id}', name: 'user_delete', methods: ['DELETE'], requirements: ['id' => '\d+'])]
     public function delete(Request $request, User $entity, StructuralElementRecursionHelper $recursionHelper): RedirectResponse
     {
+        //Disallow deleting the anonymous user
         if (User::ID_ANONYMOUS === $entity->getID()) {
-            throw new InvalidArgumentException('You can not delete the anonymous user! It is needed for permission checking without a logged in user');
+            throw new \LogicException('You can not delete the anonymous user! It is needed for permission checking without a logged in user');
+        }
+
+        //Disallow deleting the current logged-in user
+        if ($entity === $this->getUser()) {
+            throw new \LogicException('You can not delete your own user account!');
         }
 
         return $this->_delete($request, $entity, $recursionHelper);

templates/admin/_delete_form.html.twig

@@ -6,7 +6,7 @@
     <div class="form-group">
         <div class=""></div>
         <div class="col-sm offset-sm-3 ps-2">
-            {% set delete_disabled = (not is_granted("delete", entity)) or (entity.group is defined and entity.id == 1) %}
+            {% set delete_disabled = (not is_granted("delete", entity)) or (entity.group is defined and entity.id == 1) or entity == app.user %}
             <div class="btn-group">
                 <button class="btn btn-danger" {% if delete_disabled %}disabled{% endif %}>{% trans %}entity.delete{% endtrans %}</button>
                 <button type="button" class="btn btn-danger dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">