diff --git a/addons/website/views/website_templates.xml b/addons/website/views/website_templates.xml
index de4eb4fb94b..5932931688a 100644
--- a/addons/website/views/website_templates.xml
+++ b/addons/website/views/website_templates.xml
@@ -411,7 +411,7 @@
     <table class="table js_kanban">
         <thead>
             <tr>
-                <t t-set="width" t-value="str(round(100.0 / len(objects), 2)) + '%'"/>
+                <t t-set="width" t-value="str(round(100.0 / (len(objects) if objects else 1), 2)) + '%'"/>
                 <t t-foreach="objects">
                     <th t-att-width="width">
                         <div t-field="column_id.name" class="text-center"></div>