* marshal.c (mark_dump_arg): it may be called after dump_ensure.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@13961 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/marshal.c b/marshal.c
index 1d883bfdd..23669b929 100644
--- a/marshal.c
+++ b/marshal.c
@@ -153,6 +153,8 @@ static void
 mark_dump_arg(void *ptr)
 {
     struct dump_arg *p = ptr;
+    if (!ptr)
+        return;
     rb_mark_set(p->data);
     rb_mark_hash(p->compat_tbl);
 }