From 4d596650dff0417660874727964a32dae23dc9ea Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Wed, 19 Apr 2017 17:47:54 +1000
Subject: lauxlib: Only jsstring-ify if non-null

---
 src/lauxlib.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lauxlib.js b/src/lauxlib.js
index 3bf5b86..8e263fe 100644
--- a/src/lauxlib.js
+++ b/src/lauxlib.js
@@ -567,13 +567,13 @@ if (typeof require === "function") {
         };
 
         const luaL_loadfilex = function(L, filename, mode) {
-            let jsfilename = lobject.jsstring(filename);
             let lf = new LoadF();
             let fnameindex = lapi.lua_gettop(L) + 1;  /* index of filename on the stack */
             if (filename === null) {
                 lapi.lua_pushliteral(L, "=stdin");
                 lf.f = process.stdin.fd;
             } else {
+                let jsfilename = lobject.jsstring(filename);
                 lapi.lua_pushliteral(L, `@${jsfilename}`);
                 try {
                     lf.f = fs.openSync(jsfilename, "r");
-- 
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