diff --git a/app/components/dossiers/errors_full_messages_component/errors_full_messages_component.html.haml b/app/components/dossiers/errors_full_messages_component/errors_full_messages_component.html.haml
index 4b0245804..b28de1de3 100644
--- a/app/components/dossiers/errors_full_messages_component/errors_full_messages_component.html.haml
+++ b/app/components/dossiers/errors_full_messages_component/errors_full_messages_component.html.haml
@@ -1,5 +1,6 @@
-.fr-alert.fr-alert--error.fr-mb-3w{ role: "alertdialog" }
+.fr-alert.fr-alert--error.fr-mb-3w{ role: 'alert' }
   - if dedup_and_partitioned_errors.size > 0
-    %h3#sumup-errors.fr-alert__title= t('.sumup_html.title', count: dedup_and_partitioned_errors.size)
+    %h3#sumup-errors.fr-alert__title{ data: { controller: 'autofocus' }, tabindex: '-1' }
+      = t('.sumup_html.title', count: dedup_and_partitioned_errors.size)
     %p= t('.sumup_html.content', count: dedup_and_partitioned_errors.size)
     = render ExpandableErrorList.new(errors: dedup_and_partitioned_errors)
diff --git a/app/javascript/controllers/autofocus_controller.ts b/app/javascript/controllers/autofocus_controller.ts
index 289185948..72b5198ad 100644
--- a/app/javascript/controllers/autofocus_controller.ts
+++ b/app/javascript/controllers/autofocus_controller.ts
@@ -2,8 +2,10 @@ import { Controller } from '@hotwired/stimulus';
 
 export class AutofocusController extends Controller {
   connect() {
-    const element = this.element as HTMLInputElement;
+    const element = this.element as HTMLInputElement | HTMLElement;
     element.focus();
-    element.setSelectionRange(0, element.value.length);
+    if ('value' in element) {
+      element.setSelectionRange(0, element.value.length);
+    }
   }
 }