From 69ce580970550bf4bfaa60646a61e511df90f71e Mon Sep 17 00:00:00 2001
From: Takase <20792268+takase1121@users.noreply.github.com>
Date: Wed, 4 Jan 2023 23:46:08 +0800
Subject: [PATCH] do not allow users to create an empty font group (#1303)

---
 src/api/renderer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/api/renderer.c b/src/api/renderer.c
index 261fc26a..ae2c7ae0 100644
--- a/src/api/renderer.c
+++ b/src/api/renderer.c
@@ -145,6 +145,8 @@ static int f_font_group(lua_State* L) {
   luaL_checktype(L, 1, LUA_TTABLE);
 
   table_size = lua_rawlen(L, 1);
+  if (table_size <= 0)
+    return luaL_error(L, "failed to create font group: table is empty");
   if (table_size > FONT_FALLBACK_MAX)
     return luaL_error(L, "failed to create font group: table size too large");