Hi,

Here are the key points to troubleshoot the "Internal Error 500" on your Odoo website:

    Check the Odoo log files (on Odoo.sh or your server) to find the exact error message or traceback that caused the crash.

    Review any recent changes such as installing new modules, updating the website theme, or editing views or pages—these are common causes of website errors.

    Access the backend in debug mode using ?debug=1 in the URL to help you load the system and identify the issue more easily.

    If you suspect a template or theme error, try disabling the custom theme or switching back to the default Odoo theme.

    Inspect QWeb views or pages that might have been recently edited; a broken or invalid XML can prevent the site from rendering.

    If the homepage or a custom page is causing the crash, try changing the default homepage via the Website > Pages menu or through the backend.

    If you're unable to resolve the issue, restore a recent working backup or roll back to the last successful deployment (if using Odoo.sh) to recover your website quickly.

Hope it helps.

You can find the source of Error by Checking the Logs.

In Odoo On-Premises

Ubuntu (/var/log/odoo/odoo.log)

Windows (/path/to/odoo/odoo.log)

In Odoo.sh

Select the branch then go to logs tab to find the source