From b1b4733bd9f75509ffbf1243b754a8e61278b790 Mon Sep 17 00:00:00 2001
From: Fabrice Bellard <fabrice@bellard.org>
Date: Thu, 14 May 2026 15:51:22 +0200
Subject: [PATCH] fixed error handling in os.exec() (#503)

---
 quickjs-libc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/quickjs-libc.c b/quickjs-libc.c
index 99ba96f..84f990d 100644
--- a/quickjs-libc.c
+++ b/quickjs-libc.c
@@ -3309,7 +3309,7 @@ static JSValue js_os_exec(JSContext *ctx, JSValueConst this_val,
     for(i = 0; i < exec_argc; i++)
         JS_FreeCString(ctx, exec_argv[i]);
     js_free(ctx, exec_argv);
-    if (envp != environ) {
+    if (envp && envp != environ) {
         char **p;
         p = envp;
         while (*p != NULL) {