diff --git a/src/agenda_culturel/templates/agenda_culturel/filter-inc.html b/src/agenda_culturel/templates/agenda_culturel/filter-inc.html
index 5e90f8a..9dec45c 100644
--- a/src/agenda_culturel/templates/agenda_culturel/filter-inc.html
+++ b/src/agenda_culturel/templates/agenda_culturel/filter-inc.html
@@ -11,7 +11,7 @@
     </div>
 
     <div class="filtres">
-    <details {% if filter.is_active %}class="active"{% endif %} {% if filter.form.errors %}open=""{% endif %}>
+    <details {% if filter.is_active %}class="active"{% endif %} {% if filter.form and filter.form.errors %}open=""{% endif %}>
     <summary role="button" class="outline secondary">
         {% if filter.is_active %}
             <strong>Filtres&nbsp;: </strong>