MediaWiki internal error.

Original exception: [1e8e79531870dd00d4409a14] /index.php?title=%D0%A4%D0%BE%D1%80%D0%BC%D0%B0:%D0%9F%D1%83%D0%BB%D0%BB%D0%B8%D0%BF&curid=12401&diff=0&oldid=28727 Wikimedia\Assert\PostconditionException: Postcondition failed: makeTitleSafe() should always return a Title for the text returned by getRootText().
Backtrace:
from /home/c/cy87257/wiki/public_html/vendor/wikimedia/assert/src/Assert.php(203)
#0 /home/c/cy87257/wiki/public_html/includes/title/Title.php(2036): Wikimedia\Assert\Assert::postcondition(boolean, string)
#1 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/Requirements/LimitedWidthContentRequirement.php(95): MediaWiki\Title\Title->getRootTitle()
#2 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/Requirements/LimitedWidthContentRequirement.php(156): MediaWiki\Skins\Vector\FeatureManagement\Requirements\LimitedWidthContentRequirement::shouldDisableMaxWidth(array, MediaWiki\Title\Title, WebRequest)
#3 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/FeatureManager.php(161): MediaWiki\Skins\Vector\FeatureManagement\Requirements\LimitedWidthContentRequirement->isMet()
#4 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/FeatureManager.php(141): MediaWiki\Skins\Vector\FeatureManagement\FeatureManager->isFeatureEnabled(string)
#5 [internal function]: MediaWiki\Skins\Vector\FeatureManagement\FeatureManager::MediaWiki\Skins\Vector\FeatureManagement\{closure}(string)
#6 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/FeatureManager.php(142): array_map(Closure, array)
#7 /home/c/cy87257/wiki/public_html/skins/Vector/includes/SkinVector22.php(218): MediaWiki\Skins\Vector\FeatureManagement\FeatureManager->getFeatureBodyClass()
#8 /home/c/cy87257/wiki/public_html/includes/OutputPage.php(3375): MediaWiki\Skins\Vector\SkinVector22->getHtmlElementAttributes()
#9 /home/c/cy87257/wiki/public_html/includes/skins/SkinMustache.php(67): OutputPage->headElement(MediaWiki\Skins\Vector\SkinVector22)
#10 /home/c/cy87257/wiki/public_html/includes/skins/SkinTemplate.php(181): SkinMustache->generateHTML()
#11 /home/c/cy87257/wiki/public_html/includes/OutputPage.php(2899): SkinTemplate->outputPage()
#12 /home/c/cy87257/wiki/public_html/includes/MediaWiki.php(941): OutputPage->output(boolean)
#13 /home/c/cy87257/wiki/public_html/includes/MediaWiki.php(576): MediaWiki->main()
#14 /home/c/cy87257/wiki/public_html/index.php(50): MediaWiki->run()
#15 /home/c/cy87257/wiki/public_html/index.php(46): wfIndexMain()
#16 {main}

Exception caught inside exception handler: [1e8e79531870dd00d4409a14] /index.php?title=%D0%A4%D0%BE%D1%80%D0%BC%D0%B0:%D0%9F%D1%83%D0%BB%D0%BB%D0%B8%D0%BF&curid=12401&diff=0&oldid=28727 Wikimedia\Assert\PostconditionException: Postcondition failed: makeTitleSafe() should always return a Title for the text returned by getRootText().
Backtrace:
from /home/c/cy87257/wiki/public_html/vendor/wikimedia/assert/src/Assert.php(203)
#0 /home/c/cy87257/wiki/public_html/includes/title/Title.php(2036): Wikimedia\Assert\Assert::postcondition(boolean, string)
#1 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/Requirements/LimitedWidthContentRequirement.php(95): MediaWiki\Title\Title->getRootTitle()
#2 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/Requirements/LimitedWidthContentRequirement.php(156): MediaWiki\Skins\Vector\FeatureManagement\Requirements\LimitedWidthContentRequirement::shouldDisableMaxWidth(array, MediaWiki\Title\Title, WebRequest)
#3 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/FeatureManager.php(161): MediaWiki\Skins\Vector\FeatureManagement\Requirements\LimitedWidthContentRequirement->isMet()
#4 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/FeatureManager.php(141): MediaWiki\Skins\Vector\FeatureManagement\FeatureManager->isFeatureEnabled(string)
#5 [internal function]: MediaWiki\Skins\Vector\FeatureManagement\FeatureManager::MediaWiki\Skins\Vector\FeatureManagement\{closure}(string)
#6 /home/c/cy87257/wiki/public_html/skins/Vector/includes/FeatureManagement/FeatureManager.php(142): array_map(Closure, array)
#7 /home/c/cy87257/wiki/public_html/skins/Vector/includes/SkinVector22.php(218): MediaWiki\Skins\Vector\FeatureManagement\FeatureManager->getFeatureBodyClass()
#8 /home/c/cy87257/wiki/public_html/includes/OutputPage.php(3375): MediaWiki\Skins\Vector\SkinVector22->getHtmlElementAttributes()
#9 /home/c/cy87257/wiki/public_html/includes/skins/SkinMustache.php(67): OutputPage->headElement(MediaWiki\Skins\Vector\SkinVector22)
#10 /home/c/cy87257/wiki/public_html/includes/skins/SkinTemplate.php(181): SkinMustache->generateHTML()
#11 /home/c/cy87257/wiki/public_html/includes/OutputPage.php(2899): SkinTemplate->outputPage()
#12 /home/c/cy87257/wiki/public_html/includes/exception/MWExceptionRenderer.php(184): OutputPage->output()
#13 /home/c/cy87257/wiki/public_html/includes/exception/MWExceptionRenderer.php(103): MWExceptionRenderer::reportHTML(Wikimedia\Assert\PostconditionException)
#14 /home/c/cy87257/wiki/public_html/includes/exception/MWExceptionHandler.php(132): MWExceptionRenderer::output(Wikimedia\Assert\PostconditionException, integer)
#15 /home/c/cy87257/wiki/public_html/includes/exception/MWExceptionHandler.php(249): MWExceptionHandler::report(Wikimedia\Assert\PostconditionException)
#16 /home/c/cy87257/wiki/public_html/includes/MediaWiki.php(595): MWExceptionHandler::handleException(Wikimedia\Assert\PostconditionException, string)
#17 /home/c/cy87257/wiki/public_html/index.php(50): MediaWiki->run()
#18 /home/c/cy87257/wiki/public_html/index.php(46): wfIndexMain()
#19 {main}