An error occurred while moving the theme. It looks like there is a problem with the photo album system?

An error occurred while moving the theme. It looks like there is a problem with the photo album system?

Code:

Error: Call to a member function getValue() on null in src/addons/XFMG/Repository/MediaWatch.php at line 13
XFMG\Repository\MediaWatch->autoWatchMediaItem() in src/addons/XFMG/Service/Media/MirrorCreator.php at line 249
XFMG\Service\Media\MirrorCreator->XFMG\Service\Media\{closure}() in src/XF.php at line 625
XF::asVisitor() in src/addons/XFMG/Service/Media/MirrorCreator.php at line...

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