From 7601bec91a2549f027347193d00a088d4ec1e1a7 Mon Sep 17 00:00:00 2001
From: Yuan He <lendage@gmail.com>
Date: Thu, 9 Apr 2015 22:41:05 +0800
Subject: [PATCH] try to fix webpack-dev-server#149

---
 lib/OriginalSource.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/OriginalSource.js b/lib/OriginalSource.js
index 6dd8d49..519f2f0 100644
--- a/lib/OriginalSource.js
+++ b/lib/OriginalSource.js
@@ -58,7 +58,7 @@ OriginalSource.prototype.node = function(options) {
 	var node = new SourceNode(null, null, null,
 		lines.map(function(line, idx) {
 			var pos = 0;
-			if(options.columns === false) {
+			if(typeof(options) !== 'undefined' && options.columns === false) {
 				return new SourceNode(idx+1, 0, name,
 					(line + (idx != lines.length-1 ? "\n" : ""))
 				);