diff --git a/lib/plugins/userIDB.mjs b/lib/plugins/userIDB.mjs
index 5ee2d1067..c00c0137e 100644
--- a/lib/plugins/userIDB.mjs
+++ b/lib/plugins/userIDB.mjs
@@ -1,14 +1,22 @@
 export function userIDB(plugin, mapview) {
 
+  if (!mapp.user?.email) {
+
+    console.warn(`The userIDB plugin requires a mapp.user`)
+    return;
+  }
+
   // Find the btnColumn element.
   const btnColumn = document.getElementById('mapButton');
 
   if (!btnColumn) return;
 
+  plugin.title ??= "Update userIDB locale"
+
   // Append the plugin btn to the btnColumn.
   btnColumn.append(mapp.utils.html.node`
     <button
-      title="Update userIDB locale"
+      title=${plugin.title}
       onclick=${()=>{
 
         mapview.locale.layers.forEach(layer => {
@@ -20,6 +28,8 @@ export function userIDB(plugin, mapview) {
 
         mapp.utils.userIndexedDB.put('locales', mapview.locale)
 
+        alert(`User ${mapp.user.email} IndexedDB updated.`)
+
       }}>
       <div class="mask-icon" style="mask-image:url(https://fonts.gstatic.com/s/i/short-term/release/materialsymbolsoutlined/rule_settings/default/24px.svg)">`);
 }