diff --git a/addons/web_kanban/static/src/js/kanban.js b/addons/web_kanban/static/src/js/kanban.js
index 6f47f9c128d..7dd7c56a0b6 100644
--- a/addons/web_kanban/static/src/js/kanban.js
+++ b/addons/web_kanban/static/src/js/kanban.js
@@ -436,7 +436,7 @@ instance.web_kanban.KanbanView = instance.web.View.extend({
                 new_group.do_save_sequences();
             }).fail(function(error, evt) {
                 evt.preventDefault();
-                alert(_t("An error has occured while moving the record to this group: ") + data.message);
+                alert(_t("An error has occured while moving the record to this group: ") + error.data.message);
                 self.do_reload(); // TODO: use draggable + sortable in order to cancel the dragging when the rcp fails
             });
         }