diff --git a/kfet/templates/kfet/kpsul.html b/kfet/templates/kfet/kpsul.html
index 2a6eec56..946ac6b2 100644
--- a/kfet/templates/kfet/kpsul.html
+++ b/kfet/templates/kfet/kpsul.html
@@ -446,6 +446,9 @@ $(document).ready(function() {
                         cancelOperations(opes_array, password);
                     });
                     break;
+                case 400:
+                    displayErrors(getErrorsHtml(data));
+                    break;
             }
 
         });