diff --git a/edit/codemirror-editing-hooks.js b/edit/codemirror-editing-hooks.js
index 91299981..e06ae770 100644
--- a/edit/codemirror-editing-hooks.js
+++ b/edit/codemirror-editing-hooks.js
@@ -621,7 +621,7 @@ onDOMscriptReady('/codemirror.js').then(() => {
 
   function updatePreview(data, previewing) {
     if (previewing !== true && previewing !== false) {
-      if (data instanceof Event && !event.target.matches('.style-contributor')) return;
+      if (data instanceof Event && !data.target.matches('.style-contributor')) return;
       debounce(updatePreview, data && data.id === 'enabled' ? 0 : 400, null, true);
       return;
     }