From a69aef43fe1838da26c193d188580229b2387583 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Thu, 16 Oct 2025 13:13:51 +0200
Subject: Fix io.write() of newly created buffer.

Reported by vfprintf. #1386
---
 src/lj_strfmt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/lj_strfmt.c b/src/lj_strfmt.c
index 04aebaa4..bb649fc8 100644
--- a/src/lj_strfmt.c
+++ b/src/lj_strfmt.c
@@ -170,7 +170,7 @@ const char *lj_strfmt_wstrnum(lua_State *L, cTValue *o, MSize *lenp)
   } else if (tvisbuf(o)) {
     SBufExt *sbx = bufV(o);
     *lenp = sbufxlen(sbx);
-    return sbx->r;
+    return sbx->r ? sbx->r : "";
   } else if (tvisint(o)) {
     sb = lj_strfmt_putint(lj_buf_tmp_(L), intV(o));
   } else if (tvisnum(o)) {
-- 
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