diff --git a/packages/less/src/less-browser/utils.js b/packages/less/src/less-browser/utils.js
index 2a9915cc3..42a1b442e 100644
--- a/packages/less/src/less-browser/utils.js
+++ b/packages/less/src/less-browser/utils.js
@@ -9,6 +9,7 @@ export function extractId(href) {
 }
 
 export function addDataAttr(options, tag) {
+	if(!tag) return; // in case of tag is null or undefined
     for (const opt in tag.dataset) {
         if (tag.dataset.hasOwnProperty(opt)) {
             if (opt === 'env' || opt === 'dumpLineNumbers' || opt === 'rootpath' || opt === 'errorReporting') {