From 55e7656640de92645965d02dc1a155a1e2c39545 Mon Sep 17 00:00:00 2001
From: Luke Gorrie <luke@snabb.co>
Date: Mon, 8 Oct 2018 21:43:02 +0000
Subject: [PATCH] lj_ctype.c: Detect bad ctypeid without failing lua_assert

---
 src/lj_ctype.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/lj_ctype.c b/src/lj_ctype.c
index eaccb781c0..ca3694bf78 100644
--- a/src/lj_ctype.c
+++ b/src/lj_ctype.c
@@ -533,6 +533,10 @@ static void ctype_repr(CTRepr *ctr, CTypeID id)
       ctr->ok = 0;
       return;
     }
+    if (ctype_cid(info) == 0) {
+      ctr->ok = 0;
+      return;
+    }
     newct = ctype_get(ctr->cts, ctype_cid(info));
     /* Detect ctypes that are not OK due to looping. */
     if (newct == ct) {