Upgrade to 7.12.x issue

php version: 7.4.29
mysql version: 10.4.24-MariaDB

I have been exploring the upgrade process and have been working on a CRM which is currently 7.7. I have upgraded:

7.7 to 7.8.32 no problem
7.8 to 7.10.29 no problem

I wanted to go straight to 7.12.26 but I got the error below. So I tried

7.10. to 7.11.12 no problem

Then going from 7.11 to 7.12.26 the same error.

This the problem. The wizard completes the Preflight Check but returns this page on Commit Upgrade. The page has lost its formatting and clicking Next does nothing.

This is the console log.

I have followed Upgrading :: SuiteCRM Documentation guidelines.

I have also tried the Parent::Basic(); to Parent::__construct(); fix mentioned in other posts.

There no php fatal errors but here is the log if that helps. Any ideas?

[Wed Jul 20 15:09:43.699207 2022] [php7:notice] [pid 16648:tid 1892] [client 127.0.0.1:62242] PHP Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\suitecrm\modules\UpgradeWizard\index.php on line 585, referer: https://suitecrm.dev/index.php

[Wed Jul 20 15:09:43.713123 2022] [php7:notice] [pid 16648:tid 1892] [client 127.0.0.1:62242] PHP Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\suitecrm\include\MVC\View\SugarView.php on line 1021, referer: https://suitecrm.dev/index.php

[Wed Jul 20 15:09:43.713123 2022] [php7:notice] [pid 16648:tid 1892] [client 127.0.0.1:62242] PHP Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\suitecrm\include\MVC\View\SugarView.php on line 1023, referer: https://suitecrm.dev/index.php

[Wed Jul 20 15:09:43.713123 2022] [php7:notice] [pid 16648:tid 1892] [client 127.0.0.1:62242] PHP Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\suitecrm\include\MVC\View\SugarView.php on line 1268, referer: https://suitecrm.dev/index.php

[Wed Jul 20 15:09:43.713123 2022] [php7:notice] [pid 16648:tid 1892] [client 127.0.0.1:62242] PHP Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\suitecrm\include\MVC\View\SugarView.php on line 1272, referer: https://suitecrm.dev/index.php

[Wed Jul 20 15:09:43.713123 2022] [php7:notice] [pid 16648:tid 1892] [client 127.0.0.1:62242] PHP Notice: Trying to access array offset on value of type null in C:\xampp\htdocs\suitecrm\include\MVC\View\SugarView.php on line 1145, referer: https://suitecrm.dev/index.php

It turns out it was due to /themes/Suite7 and/themes/SuiteR still existed. Deleting all references to these old themes fixed the issue.

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