From 38c4a3170b793ae69a82612f420fed8a1d0d67c3 Mon Sep 17 00:00:00 2001
From: Yukihiro Matsumoto <matz@ruby-lang.org>
Date: Thu, 16 Aug 2012 22:24:13 +0900
Subject: outer might be NULL; close #428

---
 src/variable.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

(limited to 'src')

diff --git a/src/variable.c b/src/variable.c
index 9b233cde8..6d0ab7557 100644
--- a/src/variable.c
+++ b/src/variable.c
@@ -905,13 +905,16 @@ mrb_class_sym(mrb_state *mrb, struct RClass *c, struct RClass *outer)
 
   name = mrb_obj_iv_get(mrb, (struct RObject*)c, mrb_intern(mrb, "__classid__"));
   if (mrb_nil_p(name)) {
-    struct csym_arg arg;
 
-    arg.c = c;
-    arg.sym = 0;
+    if (!outer) return 0;
+    else {
+      struct csym_arg arg;
 
-    iv_foreach(mrb, outer->iv, csym_i, &arg);
-    return arg.sym;
+      arg.c = c;
+      arg.sym = 0;
+      iv_foreach(mrb, outer->iv, csym_i, &arg);
+      return arg.sym;
+    }
   }
   return SYM2ID(name);
 }
-- 
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