From 1d2e9be8802b7459620a6b154ee59af08b61d07a Mon Sep 17 00:00:00 2001
From: msidolphin <OoMass-EffectoO@hotmail.com>
Date: Thu, 24 Jan 2019 17:13:54 +0800
Subject: [PATCH] file path maybe undefined

---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 521bec2..27c4442 100755
--- a/index.js
+++ b/index.js
@@ -33,7 +33,7 @@ module.exports = postcss.plugin('postcss-px-to-viewport', function (options) {
     css.walkDecls(function (decl, i) {
       
       // Add exlclude option to ignore some files like 'node_modules' 
-      if (opts.exclude) {
+      if (opts.exclude && decl.source.input.file) {
         if (Object.prototype.toString.call(opts.exclude) === '[object RegExp]') {
           if (!handleExclude(opts.exclude, decl.source.input.file)) return;
         } else if (Object.prototype.toString.call(opts.exclude) === '[object Array]') {