From 1593e7750b29d11b71f20dbde85845b7b0689d1d Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sat, 18 May 2013 14:11:59 +0200
Subject: [PATCH] FFI: Improve error messages for arithmetic and comparison
 operators.

---
 src/lj_carith.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lj_carith.c b/src/lj_carith.c
index 18708d66..afe7e682 100644
--- a/src/lj_carith.c
+++ b/src/lj_carith.c
@@ -238,7 +238,7 @@ static int lj_carith_meta(lua_State *L, CTState *cts, CDArith *ca, MMS mm)
       return 1;
     }
     for (i = 0; i < 2; i++) {
-      if (ca->ct[i]) {
+      if (ca->ct[i] && tviscdata(L->base+i)) {
 	if (ctype_isenum(ca->ct[i]->info)) isenum = i;
 	repr[i] = strdata(lj_ctype_repr(L, ctype_typeid(cts, ca->ct[i]), NULL));
       } else {