From a085c04e3741825ab4c4ceda60b640e250ae56d5 Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Sat, 12 Sep 2015 12:11:10 +0900
Subject: Don't crash if NULL is passed to mrb_close

Sometimes it is very useful just return from mrb_close if NULL is
passed as mrb.  This is the same spirit of free(3), which just does
nothing if NULL is passed.
---
 src/state.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/state.c b/src/state.c
index 2efd34334..bfd99e4c3 100644
--- a/src/state.c
+++ b/src/state.c
@@ -234,6 +234,7 @@ mrb_free_context(mrb_state *mrb, struct mrb_context *c)
 MRB_API void
 mrb_close(mrb_state *mrb)
 {
+  if (!mrb) return;
   if (mrb->atexit_stack_len > 0) {
     mrb_int i;
     for (i = mrb->atexit_stack_len; i > 0; --i) {
-- 
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