From 4516ca0bb52635ed6a310fc2e9ce56a441d675c5 Mon Sep 17 00:00:00 2001
From: Alex Orlenko <zxteam@protonmail.com>
Date: Tue, 7 Jun 2022 17:59:22 +0100
Subject: [PATCH] Forgotten part of userdata performance optimization for Lua
 5.1

---
 src/lua.rs | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/lua.rs b/src/lua.rs
index fd8bab7..5efbe55 100644
--- a/src/lua.rs
+++ b/src/lua.rs
@@ -2822,10 +2822,15 @@ impl Lua {
 
         // Set empty environment for Lua 5.1
         #[cfg(any(feature = "lua51", feature = "luajit"))]
-        protect_lua!(self.state, 1, 1, fn(state) {
-            ffi::lua_newtable(state);
-            ffi::lua_setuservalue(state, -2);
-        })?;
+        if protect {
+            protect_lua!(self.state, 1, 1, fn(state) {
+                ffi::lua_newtable(state);
+                ffi::lua_setuservalue(state, -2);
+            })?;
+        } else {
+            ffi::lua_newtable(self.state);
+            ffi::lua_setuservalue(self.state, -2);
+        }
 
         Ok(AnyUserData(self.pop_ref()))
     }