Fix expired admin session

[johnulecan]

Description (*)

Updated At is null if the session does not exist. Ex: Expired from Redis, removed from disk

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes M 2.4.3-p1 - TypeError in AdminSessionsManager.php:338 (strtotime() expects parameter 1 to be string, int given) #34415

Manual testing scenarios (*)

1. Login in admin
2. Wait untill session expiress
3. Refresh the page
4. You should see in logs main.CRITICAL: TypeError: strtotime() expects parameter 1 to be string, null given in ..vendor/magento/module-security/Model/AdminSessionInfo.php:136

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

[m2-assistant]

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