broken on MW 1.44

[MacFan4000]

trying to use this skin on MWW 1.44 results in the following fatal:

MediaWiki internal error.

Original exception: [0af1a31f96bfd4a68a01d1c1] /index.php?title=Main_Page&useskin=onyx Error: Class "Title" not found
Backtrace:
from /data/project/skins/public_html/skins/Onyx/includes/ExtraSkinData.php(143)
#0 /data/project/skins/public_html/skins/Onyx/includes/ExtraSkinData.php(134): Onyx\ExtraSkinData::renderPage()
#1 /data/project/skins/public_html/skins/Onyx/includes/ExtraSkinData.php(20): Onyx\ExtraSkinData::getCustomSidebarModules()
#2 /data/project/skins/public_html/skins/Onyx/includes/OnyxTemplate.php(57): Onyx\ExtraSkinData::extractAndUpdate()
#3 /data/project/skins/public_html/includes/skins/SkinTemplate.php(168): OnyxTemplate->execute()
#4 /data/project/skins/public_html/includes/skins/SkinTemplate.php(187): MediaWiki\Skin\SkinTemplate->generateHTML()
#5 /data/project/skins/public_html/includes/skins/Skin.php(682): MediaWiki\Skin\SkinTemplate->outputPage()
#6 /data/project/skins/public_html/includes/Output/OutputPage.php(3286): MediaWiki\Skin\Skin->outputPageFinal()
#7 /data/project/skins/public_html/includes/actions/ActionEntryPoint.php(160): MediaWiki\Output\OutputPage->output()
#8 /data/project/skins/public_html/includes/MediaWikiEntryPoint.php(202): MediaWiki\Actions\ActionEntryPoint->execute()
#9 /data/project/skins/public_html/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#10 {main}

Exception caught inside exception handler: [0af1a31f96bfd4a68a01d1c1] /index.php?title=Main_Page&useskin=onyx Error: Class "Title" not found
Backtrace:
from /data/project/skins/public_html/skins/Onyx/includes/ExtraSkinData.php(143)
#0 /data/project/skins/public_html/skins/Onyx/includes/ExtraSkinData.php(134): Onyx\ExtraSkinData::renderPage()
#1 /data/project/skins/public_html/skins/Onyx/includes/ExtraSkinData.php(20): Onyx\ExtraSkinData::getCustomSidebarModules()
#2 /data/project/skins/public_html/skins/Onyx/includes/OnyxTemplate.php(57): Onyx\ExtraSkinData::extractAndUpdate()
#3 /data/project/skins/public_html/includes/skins/SkinTemplate.php(168): OnyxTemplate->execute()
#4 /data/project/skins/public_html/includes/skins/SkinTemplate.php(187): MediaWiki\Skin\SkinTemplate->generateHTML()
#5 /data/project/skins/public_html/includes/skins/Skin.php(682): MediaWiki\Skin\SkinTemplate->outputPage()
#6 /data/project/skins/public_html/includes/Output/OutputPage.php(3286): MediaWiki\Skin\Skin->outputPageFinal()
#7 /data/project/skins/public_html/includes/exception/MWExceptionRenderer.php(197): MediaWiki\Output\OutputPage->output()
#8 /data/project/skins/public_html/includes/exception/MWExceptionRenderer.php(116): MediaWiki\Exception\MWExceptionRenderer::reportHTML()
#9 /data/project/skins/public_html/includes/exception/MWExceptionHandler.php(137): MediaWiki\Exception\MWExceptionRenderer::output()
#10 /data/project/skins/public_html/includes/exception/MWExceptionHandler.php(241): MediaWiki\Exception\MWExceptionHandler::report()
#11 /data/project/skins/public_html/includes/MediaWikiEntryPoint.php(222): MediaWiki\Exception\MWExceptionHandler::handleException()
#12 /data/project/skins/public_html/includes/actions/ActionEntryPoint.php(79): MediaWiki\MediaWikiEntryPoint->handleTopLevelError()
#13 /data/project/skins/public_html/includes/MediaWikiEntryPoint.php(208): MediaWiki\Actions\ActionEntryPoint->handleTopLevelError()
#14 /data/project/skins/public_html/index.php(58): MediaWiki\MediaWikiEntryPoint->run()
#15 {main}

This would be due to upstream changes concerning the Title class.