From 1cb4954dc1ff3dcfa6c58b0377cec0692038e4fa Mon Sep 17 00:00:00 2001
From: chinesepowered <nlai@rediffmail.com>
Date: Tue, 7 Apr 2026 08:52:20 -0700
Subject: [PATCH] fix(sandbox): fall back to 'latest' tag when image name has
 no colon

If the sandbox image name has no explicit :tag and QWEN_SANDBOX_IMAGE_TAG
is unset, imageName.split(':')[1] returns undefined, producing a bogus
build target like 'myimage:undefined'. Fall back to 'latest' to match
Docker's conventional default.
---
 scripts/build_sandbox.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/build_sandbox.js b/scripts/build_sandbox.js
index 55e8a79bbc..69b06cb351 100644
--- a/scripts/build_sandbox.js
+++ b/scripts/build_sandbox.js
@@ -135,7 +135,7 @@ function buildImage(imageName, dockerfile) {
   ).version;
 
   const imageTag =
-    process.env.QWEN_SANDBOX_IMAGE_TAG || imageName.split(':')[1];
+    process.env.QWEN_SANDBOX_IMAGE_TAG || imageName.split(':')[1] || 'latest';
   const finalImageName = `${imageName.split(':')[0]}:${imageTag}`;
 
   try {