From 95fae80658cd13ecd1544095905ec68c14238af4 Mon Sep 17 00:00:00 2001
From: Yuichi Nishiwaki <yuichi.nishiwaki@gmail.com>
Date: Thu, 13 Feb 2014 15:37:15 +0900
Subject: [PATCH] pic->envp is nullable

---
 src/system.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/system.c b/src/system.c
index 8c8ce084..c8d2ac7b 100644
--- a/src/system.c
+++ b/src/system.c
@@ -103,6 +103,10 @@ pic_system_getenvs(pic_state *pic)
 
   pic_get_args(pic, "");
 
+  if (! pic->envp) {
+    return pic_nil_value();
+  }
+
   for (envp = pic->envp; *envp; ++envp) {
     pic_value key, val;
     int i;