1 files changed, 2 insertions, 0 deletions
diff --git a/marshal.c b/marshal.c
index 1d883bfdd6..23669b9290 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);
 }