1 files changed, 4 insertions, 0 deletions
diff --git a/app/assets/javascripts/syntax_highlight.js b/app/assets/javascripts/syntax_highlight.js
index cb2bf24abc7..065e1080897 100644
--- a/app/assets/javascripts/syntax_highlight.js
+++ b/app/assets/javascripts/syntax_highlight.js
@@ -15,6 +15,10 @@ export default function syntaxHighlight($els = null) {
 
   const els = $els.get ? $els.get() : $els;
   const handler = (el) => {
+    if (el.classList === undefined) {
+      return el;
+    }
+
     if (el.classList.contains('js-syntax-highlight')) {
       // Given the element itself, apply highlighting
       return el.classList.add(gon.user_color_scheme);