From 5dc688fb1205b9e0f8ae2b531786371c1a6e794b Mon Sep 17 00:00:00 2001
From: Clayton Smith <clayton.smith@shopify.com>
Date: Thu, 17 Aug 2017 12:13:41 -0400
Subject: Check whether internal khash is initialized in Hash#compact!

---
 mrbgems/mruby-hash-ext/src/hash-ext.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mrbgems/mruby-hash-ext/src/hash-ext.c b/mrbgems/mruby-hash-ext/src/hash-ext.c
index 00d0c4eaa..952f2eb64 100644
--- a/mrbgems/mruby-hash-ext/src/hash-ext.c
+++ b/mrbgems/mruby-hash-ext/src/hash-ext.c
@@ -52,6 +52,7 @@ hash_compact_bang(mrb_state *mrb, mrb_value hash)
   khash_t(ht) *h = RHASH_TBL(hash);
   mrb_int n = -1;
 
+  if (!h) return mrb_nil_value();
   for (k = kh_begin(h); k != kh_end(h); k++) {
     if (kh_exist(h, k)) {
       mrb_value val = kh_value(h, k).v;
-- 
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