diff --git a/edit/base.js b/edit/base.js
index b5d54726..c52ef1f7 100644
--- a/edit/base.js
+++ b/edit/base.js
@@ -363,14 +363,12 @@ function DirtyReporter() {
 }
 
 function LivePreview() {
+  let el;
   let data;
   let port;
   let preprocess;
   let enabled = prefs.get('editor.livePreview');
 
-  const el = $('#preview-errors');
-  el.onclick = () => messageBoxProxy.alert(el.title, 'pre');
-
   prefs.subscribe('editor.livePreview', (key, value) => {
     if (!value) {
       if (port) {
@@ -410,6 +408,8 @@ function LivePreview() {
     port.onDisconnect.addListener(err => {
       throw err;
     });
+    el = $('#preview-errors');
+    el.onclick = () => messageBoxProxy.alert(el.title, 'pre');
   }
 
   async function updatePreviewer(data) {