diff --git a/src/components/UserDetail.svelte b/src/components/UserDetail.svelte
index e60db298..6bf0f51b 100644
--- a/src/components/UserDetail.svelte
+++ b/src/components/UserDetail.svelte
@@ -2,6 +2,7 @@
   import { _ } from "svelte-i18n";
   import lodashIsEqual from "lodash.isequal";
   import store from "../store";
+  import isEmail from "validator/es/lib/isEmail";
   import { UserService, UserGroupService } from "@odit/lfk-client-js";
   import Toastify from "toastify-js";
   import PromiseError from "./PromiseError.svelte";
@@ -72,7 +73,8 @@
   $: groups_changed =
     JSON.stringify(usergroups_array) ===
     JSON.stringify(usergroups_array_original);
-  $: save_enabled = changes_performed || !groups_changed;
+  $: save_enabled =
+    (changes_performed || !groups_changed) && isEmail(editable_userdata.email);
   function submit() {
     if (data_loaded === true && save_enabled) {
       editable_userdata.groups = usergroups_array;