diff --git a/src/templates/pad.html b/src/templates/pad.html
index ca410154c..80d28de5a 100644
--- a/src/templates/pad.html
+++ b/src/templates/pad.html
@@ -441,20 +441,19 @@
 
   <script type="text/javascript" src="../static/js/require-kernel.js?v=<%=settings.randomVersionString%>"></script>
 
-  <!-- Include pad_utils manually -->
-  <script type="text/javascript" src="../javascripts/lib/ep_etherpad-lite/static/js/pad_utils.js?callback=require.define&v=<%=settings.randomVersionString%>"></script>
-
   <script type="text/javascript">
       // @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt
       (function() {
         // Display errors on page load to the user
         // (Gets overridden by padutils.setupGlobalExceptionHandler)
-        var originalHandler = window.onerror;
+        const originalHandler = window.onerror;
         window.onerror = function(msg, url, line) {
-          var box   = document.getElementById('editorloadingbox');
-          box.innerHTML = '<p><b>An error occurred while loading the pad</b></p>'
-                        + '<p><b>'+msg+'</b> '
-                        + '<small>in '+ padutils.escapeHTML(url) +' (line '+ line +')</small></p>';
+          const box   = document.getElementById('editorloadingbox');
+          const cleanMessage = msg.replace(/[^0-9a-zA-Z=\.?&:\/]+/,'');
+          const cleanSource = url.replace(/[^0-9a-zA-Z=\.?&:\/]+/,'');
+          const cleanLine = parseInt(line);
+          box.innerText = `An error occurred while loading the pad\n${cleanMessage} in
+            ${cleanSource} at line ${cleanLine}`
           // call original error handler
           if(typeof(originalHandler) == 'function') originalHandler.call(null, arguments);
         };