From a3cfe755ab3e758046c3f4e30938ac8d567ed046 Mon Sep 17 00:00:00 2001
From: dearblue <dearblue@users.noreply.github.com>
Date: Sat, 19 Jan 2019 10:11:37 +0900
Subject: [PATCH] Fix NULL pointer dereference `mrb->c` by `mark_context()`

---
 src/gc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/gc.c b/src/gc.c
index c67454f5f..bf544fc12 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -1277,6 +1277,7 @@ mrb_full_gc(mrb_state *mrb)
 {
   mrb_gc *gc = &mrb->gc;
 
+  if (!mrb->c) return;
   if (gc->disabled || gc->iterating) return;
 
   GC_INVOKE_TIME_REPORT("mrb_full_gc()");