XF 2.3 How do we create a child theme or duplicate theme now?

Renegade

Well-known member
I just created the child theme using the xenforo default and the site stops loading. While trying to access the style properties I get the following error.

Similarly, if I export and import a theme, I get a blank page on the forum.

Code:
Error: Call to a member function getVariationValue() on null in src/XF/Repository/StylePropertyRepository.php at line 110

    XF\Repository\StylePropertyRepository->getStyleColorData() in src/XF/Admin/Controller/StyleController.php at line 377
    XF\Admin\Controller\StyleController->actionStylePropertiesGroup() in src/XF/Mvc/Dispatcher.php at line 362
    XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 265
    XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 121
    XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 63
    XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2826
    XF\App->run() in src/XF.php at line 806
    XF::runApp() in admin.php at line 15

Has the mechanism to create a child theme changed in XF2.3? I could not find any guides and information pointing to the same?
 
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