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

I'm trying to go into the Page settings to add a custom background to an imported style, but I keep getting this, no matter if I change the style same to something else.

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...

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