fix

app/views/admin/communication/blocks/templates/timeline/_edit.html.erb

@@ -18,7 +18,7 @@
           </div>
           <div>
             <a  class="btn btn-sm btn-danger ms-3"
-                v-on:click="data.elements.splice(data.elements.indexOf(event), 1)"
+                v-on:click="data.elements.splice(data.elements.indexOf(element), 1)"
                 title="<%= t '.remove_event' %>">
                 <i class="fas fa-times"></i>
             </a>