# Base Code checks upstream changes before they reach main

By Steven Van · 2026-09-28

Failed upstream commits no longer touch an app's working main, and Base44 offers a repair branch instead.

Commits that come from your repository are now tried in a separate sandbox before they land on the main branch of an app in [Base44](<https://creatorstoolbox.com/tools/base44>). If the check fails, the working main is left as it was and Base44 offers a repair branch instead.

The change applies to apps connected through Base Code. It is listed under developer tools in the [Base Code documentation](<https://docs.base44.com/Getting-Started/base-code>) and the September 28 release notes.

![Base Code showing the AI chat, project files, a working branch, Preview, and Create PR](<https://mintcdn.com/base44/14mHcwtsjgXgI4LR/images/base-code-hero-animated.gif?s=e70877ead77d357b9f715e8ee11adb45>)

Base Code with AI chat, project files, a working branch, Preview and Create PR

![Base44](<https://www.google.com/s2/favicons?domain=base44.com&sz=128>)

Base44

AI app builder — describe what you want and get a fully functional web app in seconds, no coding required.

[View Base44 →](<https://creatorstoolbox.com/tools/base44>)

[Original source](<https://docs.base44.com/Getting-Started/base-code>)

[Read Base Code checks upstream changes before they reach main on Creators Toolbox](<https://creatorstoolbox.com/blog/base44-base-code-checks-upstream-changes-before-they-reach-main>)

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Canonical source: https://creatorstoolbox.com/blog/base44-base-code-checks-upstream-changes-before-they-reach-main