MediaWiki internal error.

Original exception: [ZgWfQZH_Kx4qRcRFnf5FcgAAABY] /index.php?title=Summary:Semantic_Templates&diff=prev&oldid=7829 Wikimedia\Assert\PostconditionException: Postcondition failed: makeTitleSafe() should always return a Title for the text returned by getRootText().
Backtrace:
from /home3/bestprac/public_html/vendor/wikimedia/assert/src/Assert.php(202)
#0 /home3/bestprac/public_html/includes/Title.php(2036): Wikimedia\Assert\Assert::postcondition(boolean, string)
#1 /home3/bestprac/public_html/includes/skins/Skin.php(518): Title->getRootTitle()
#2 /home3/bestprac/public_html/skins/MinervaNeue/includes/Skins/SkinMinerva.php(241): Skin->getPageClasses(Title)
#3 /home3/bestprac/public_html/includes/OutputPage.php(3147): SkinMinerva->getPageClasses(Title)
#4 /home3/bestprac/public_html/includes/skins/SkinTemplate.php(437): OutputPage->headElement(SkinMinerva)
#5 /home3/bestprac/public_html/skins/MinervaNeue/includes/Skins/SkinMinerva.php(125): SkinTemplate->prepareQuickTemplate()
#6 /home3/bestprac/public_html/skins/MinervaNeue/includes/Skins/SkinMinerva.php(78): SkinMinerva->prepareQuickTemplate()
#7 /home3/bestprac/public_html/includes/skins/SkinMustache.php(56): SkinMinerva->getTemplateData()
#8 /home3/bestprac/public_html/includes/skins/SkinTemplate.php(144): SkinMustache->generateHTML()
#9 /home3/bestprac/public_html/includes/OutputPage.php(2644): SkinTemplate->outputPage()
#10 /home3/bestprac/public_html/includes/MediaWiki.php(946): OutputPage->output(boolean)
#11 /home3/bestprac/public_html/includes/MediaWiki.php(959): MediaWiki::{closure}()
#12 /home3/bestprac/public_html/includes/MediaWiki.php(563): MediaWiki->main()
#13 /home3/bestprac/public_html/index.php(53): MediaWiki->run()
#14 /home3/bestprac/public_html/index.php(46): wfIndexMain()
#15 {main}

Exception caught inside exception handler: [ZgWfQZH_Kx4qRcRFnf5FcgAAABY] /index.php?title=Summary:Semantic_Templates&diff=prev&oldid=7829 Wikimedia\Assert\PostconditionException: Postcondition failed: makeTitleSafe() should always return a Title for the text returned by getRootText().
Backtrace:
from /home3/bestprac/public_html/vendor/wikimedia/assert/src/Assert.php(202)
#0 /home3/bestprac/public_html/includes/Title.php(2036): Wikimedia\Assert\Assert::postcondition(boolean, string)
#1 /home3/bestprac/public_html/includes/skins/Skin.php(518): Title->getRootTitle()
#2 /home3/bestprac/public_html/skins/MinervaNeue/includes/Skins/SkinMinerva.php(241): Skin->getPageClasses(Title)
#3 /home3/bestprac/public_html/includes/OutputPage.php(3147): SkinMinerva->getPageClasses(Title)
#4 /home3/bestprac/public_html/includes/skins/SkinTemplate.php(437): OutputPage->headElement(SkinMinerva)
#5 /home3/bestprac/public_html/skins/MinervaNeue/includes/Skins/SkinMinerva.php(125): SkinTemplate->prepareQuickTemplate()
#6 /home3/bestprac/public_html/skins/MinervaNeue/includes/Skins/SkinMinerva.php(78): SkinMinerva->prepareQuickTemplate()
#7 /home3/bestprac/public_html/includes/skins/SkinMustache.php(56): SkinMinerva->getTemplateData()
#8 /home3/bestprac/public_html/includes/skins/SkinTemplate.php(144): SkinMustache->generateHTML()
#9 /home3/bestprac/public_html/includes/OutputPage.php(2644): SkinTemplate->outputPage()
#10 /home3/bestprac/public_html/includes/exception/MWExceptionRenderer.php(158): OutputPage->output()
#11 /home3/bestprac/public_html/includes/exception/MWExceptionRenderer.php(77): MWExceptionRenderer::reportHTML(Wikimedia\Assert\PostconditionException)
#12 /home3/bestprac/public_html/includes/exception/MWExceptionHandler.php(107): MWExceptionRenderer::output(Wikimedia\Assert\PostconditionException, integer)
#13 /home3/bestprac/public_html/includes/exception/MWExceptionHandler.php(202): MWExceptionHandler::report(Wikimedia\Assert\PostconditionException)
#14 /home3/bestprac/public_html/includes/MediaWiki.php(582): MWExceptionHandler::handleException(Wikimedia\Assert\PostconditionException, string)
#15 /home3/bestprac/public_html/index.php(53): MediaWiki->run()
#16 /home3/bestprac/public_html/index.php(46): wfIndexMain()
#17 {main}