From 3ffa514fbe735f9b23272086a4664c714c13fe87 Mon Sep 17 00:00:00 2001
From: Tommy Yu <y@metatoaster.com>
Date: Sun, 5 Mar 2017 04:25:37 +1300
Subject: [PATCH] fix: only use $HOME environmental variable if it exists

---
 index.js | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/index.js b/index.js
index 2ce4b58..06ceff6 100644
--- a/index.js
+++ b/index.js
@@ -77,10 +77,13 @@ var getFirefoxWithFallbackOnOSX = function() {
   var homeBin;
   for (var i = 0; i < firefoxDirNames.length; i++) {
     bin = prefix + firefoxDirNames[i] + suffix;
-    homeBin = path.join(process.env.HOME, bin);
 
-    if (fs.existsSync(homeBin)) {
-      return homeBin;
+    if ('HOME' in process.env) {
+      homeBin = path.join(process.env.HOME, bin);
+
+      if (fs.existsSync(homeBin)) {
+        return homeBin;
+      }
     }
 
     if (fs.existsSync(bin)) {