From 0f271f38454f60f6ee0039ab5b0cbb4173a41cfa Mon Sep 17 00:00:00 2001
From: 5UtJAjiRWj1q <55706547+5UtJAjiRWj1q@users.noreply.github.com>
Date: Tue, 5 May 2020 04:26:18 +0200
Subject: [PATCH] issue#3481 ignore missing debugInfo (#3482)

---
 lib/less/tree/debug-info.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/less/tree/debug-info.js b/lib/less/tree/debug-info.js
index 096386d11..71424c8dd 100644
--- a/lib/less/tree/debug-info.js
+++ b/lib/less/tree/debug-info.js
@@ -16,9 +16,10 @@ const debugInfo = (context, ctx, lineSeparator) => {
     return result;
 };
 
-debugInfo.asComment = ctx => `/* line ${ctx.debugInfo.lineNumber}, ${ctx.debugInfo.fileName} */\n`;
+debugInfo.asComment = ctx => ctx.debugInfo ? `/* line ${ctx.debugInfo.lineNumber}, ${ctx.debugInfo.fileName} */\n` : '';
 
 debugInfo.asMediaQuery = ctx => {
+    if (!ctx.debugInfo) { return ''; }
     let filenameWithProtocol = ctx.debugInfo.fileName;
     if (!/^[a-z]+:\/\//i.test(filenameWithProtocol)) {
         filenameWithProtocol = `file://${filenameWithProtocol}`;